case study questions of chemical reactions and equations class 10

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CBSE 10th Standard Science Subject Chemical Reactions and Equations Chapter Case Study Questions With Solution 2021

By QB365 on 21 May, 2021

QB365 Provides the updated CASE Study Questions for Class 10 , and also provide the detail solution for each and every case study questions . Case study questions are latest updated question pattern from NCERT, QB365 will helps to get more marks in Exams

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Cbse 10th standard science subject chemical reactions and equations case study questions with solution 2021.

10th Standard CBSE

Final Semester - June 2015

Chemical equation is a method of representing a chemical reaction with the help of symbols and formulae of the substances involved in it. In a chemical equation, the substances which combine or react are called reactants and new substances produced are called products. A chemical equation is a short hand method of representing a chemical reaction. A balanced chemical equation has equal number of atoms of different elements in the reactants and products side. An unbalanced chemical equation has unequal number of atoms of one or more elements in reactants and products. Formulae of elements and compounds are not changed to balance an equation. (i) Consider the following reaction: pMg 3 N 2 + qH 2 O ⇾ rMg(OH) 2 + sNH 3 When the equation is balanced, the coefficients p, q, r, s respectively are

(ii) Which of the following information is not conveyed by a balanced chemical equation?

(iii) The balancing of chemical equations is in accordance with

(iv) Which of the following chemical equations is an unbalanced one?

(v) Which of the following statements is/are correct?

In decomposition reactions, a single reactant breaks down to form two or more products. A decomposition reaction is opposite to combination reaction. Thermal decomposition reactions use the energy in form of heat for the decomposition of reactants. Electrolytic decomposition reactions involve the use of electrical energy for the decomposition of reactant molecules. Photolysis or photochemical decomposition involves the use of light energy for the purpose of decomposition. (i) Which of the following reactions is a decomposition reaction?

\({ (ii) \ } 2 \mathrm{~Pb}\left(\mathrm{NO}_{3}\right)_{2} \longrightarrow 2 \mathrm{PbO}+n A+\mathrm{O}_{2}\) What is nA in the given reaction?

(iii) Amino acid is formed by the decomposition of which component of our diet?

(iv) Silver chloride on exposure to sunlight for a long duration turns grey due to (I) the formation of silver by decomposition of silver chloride (II) sublimation of silver chloride (III) decomposition of chlorine gas from silver chloride (IV) oxidation of silver chloride The correct statement(s) is/are

(v) What type of chemical reaction takes place when electricity is passed through water?

Redox reactions are those reactions in which oxidation and reduction occur Simultaneously. A redox reaction is made up of two half reactions. In the first half reaction, oxidation takes place and in second half reaction, reduction occurs. Oxidation is a process in which a substance loses electrons and in reduction, a substance gains electrons. The substance which gains electrons is reduced and acts as an oxidising agent. On the other hand, a substance which loses electrons is oxidised and acts as a reducing agent. (i) Which of the following is a redox reaction?

\({ (a) \ } \mathrm{CaCO}_{3} \rightarrow \mathrm{CaO}+\mathrm{CO}_{2}\)	\(\text { (b) } \mathrm{H}_{2}+\mathrm{Cl}_{2} \rightarrow 2 \mathrm{HCl}\)
\({ (c) \ } \mathrm{CaO}+2 \mathrm{HCl} \rightarrow \mathrm{CaCl}_{2}+\mathrm{H}_{2} \mathrm{O}\)	\(\text { (d) } \mathrm{NaOH}+\mathrm{HCl} \rightarrow \mathrm{NaCl}+\mathrm{H}_{2} \mathrm{O}\)

(ii) Identify the reaction in which H2 02 is acting as a reducing agent.

\(\text { (a) } \mathrm{H}_{2} \mathrm{SO}_{3}+\mathrm{H}_{2} \mathrm{O}_{2} \longrightarrow \mathrm{H}_{2} \mathrm{SO}_{4}+\mathrm{H}_{2} \mathrm{O}\)	\(\text { (b) } 2 \mathrm{Hl}+\mathrm{H}_{2} \mathrm{O}_{2} \longrightarrow 2 \mathrm{H}_{2} \mathrm{O}+\mathrm{I}_{2}\)
\(\text { (c) } \mathrm{Cl}_{2}+\mathrm{H}_{2} \mathrm{O}_{2} \longrightarrow 2 \mathrm{HCl}+\mathrm{O}_{2}\)	\(\text { (d) } 2 \mathrm{FeCl}_{2}+2 \mathrm{HCl}+\mathrm{H}_{2} \mathrm{O}_{2} \longrightarrow 2 \mathrm{FeCl}_{3}+2 \mathrm{H}_{2} \mathrm{O}\)

(iii) For the following reactions, identify the one in which H 2 S acts as a reducing agent.

\(\text { (a) } \mathrm{CuSO}_{4}+\mathrm{H}_{2} \mathrm{~S} \longrightarrow \mathrm{CuS}+\mathrm{H}_{2} \mathrm{SO}_{4}\)	\(\text { (b) } \mathrm{Cd}\left(\mathrm{NO}_{3}\right)_{2}+\mathrm{H}_{2} \mathrm{~S} \longrightarrow \mathrm{CdS}+2 \mathrm{HNO}_{3}\)
\(\text { (c) } 2 \mathrm{FeCl}_{3}+\mathrm{H}_{2} \mathrm{~S} \longrightarrow 2 \mathrm{FeCl}_{2}+2 \mathrm{HCl}+\mathrm{S}\)	(d) None of these

(iv) For the following reaction, identify the correct statement. \(\mathrm{ZnO}+\mathrm{CO} \longrightarrow \mathrm{Zn}+\mathrm{CO}_{2}\)

	is being oxidised

(v) In the following reaction, which substance is reduced? \(\mathrm{PbS}+4 \mathrm{H}_{2} \mathrm{O}_{2} \longrightarrow \mathrm{PbSO}_{4}+4 \mathrm{H}_{2} \mathrm{O}\)

In a balanced chemical reaction, equal number of atoms are present on both sides of reaction. A balanced chemical reaction is based on law of conservation of mass which means that total mass of reactants and products participating in a reaction must be equal. For example, a balanced chemical equation of burning of magnesium in oxygen to form magnesium oxide is written as : \(2 \mathrm{Mg}+\mathrm{O}_{2} \longrightarrow 2 \mathrm{MgO}\) The mass of reactants (2 x 24 + 32 = 80) is equal to the mass of products [2 x (24 + 16) = 80] (i) In a reaction, 35 g of reactant, PQ breaks down into 20 g of product, P and an unknown amount of product, Q. Using the law of conservation of mass, weight of products, Q will be

(

(ii) When solid mercury (II) oxide is heated, liquid mercury and oxygen gas are produced. Which of the following statements is true regarding the balanced chemical equation for this process? (a) 1 mole of mercury (II) oxide produces two moles of mercury and one mole of oxygen gas (b) 2 moles of mercury (II) oxide produce one mole of mercury and one mole of oxygen gas (c) 1 mole of mercury (II) oxide produces half mole of mercury and half mole of oxygen gas (d) 2 moles of mercury (II) oxide produce 2 moles of mercury and one mole of oxygen gas (iii) Which of the following laws is satisfied by a balanced chemical equation?

(iv) In the given chemical reaction \(\mathrm{C}_{6} \mathrm{H}_{6(l)}+15 \mathrm{O}_{2(g)} \longrightarrow m \mathrm{CO}_{2(g)}+n \mathrm{H}_{2} \mathrm{O}_{(l)}\) The values of m and n are respectively

(

(v) Sulphur dioxide reacts with oxygen to form sulphur trioxide. What would be the molar ratio of sulphur dioxide to sulphur trioxide?

In a chemical reaction, reactants are converted into products. The conversion of reactants into products in a chemical reaction is often accompanied by some features which can be observed easily. These easily observed features which take place as a result of chemical reaction are known as characteristics of chemicals reactions. Some important characteristics of chemical reactions are: (I) Evolution of heat (II) Formation of precipitate (III) Change in colour (IV) Change in temperature (V) Change in state Anyone of these general characteristics can tell us whether a chemical reaction has taken place or not. (i) Reaction of magnesium with air is a/an

(ii) In the following reaction \(\mathrm{Ca}_{(a q)}^{2+}+2 \mathrm{OH}_{(a q)}^{-} \longrightarrow \mathrm{Ca}(\mathrm{OH})_{2(s)}\) precipitate of calcium hydroxide will be of

(iii) In the given reaction, \(\mathrm{S}_{(s)}+\mathrm{O}_{2(g)} \longrightarrow \mathrm{SO}_{2}\) the physical state of SO 2 is

(iv) Which one of the following processes involve chemical reactions?

(v) In which of the following reactions, high amount of heat energy will be evolved?

*****************************************

Cbse 10th standard science subject chemical reactions and equations case study questions with solution 2021 answer keys.

\({ (i) }(\mathrm{b}): \mathrm{Mg}_{3} \mathrm{~N}_{2}+6 \mathrm{H}_{2} \mathrm{O} \longrightarrow 3 \mathrm{Mg}(\mathrm{OH})_{2}+2 \mathrm{NH}_{3}\) (ii) (d) (iii) (c): In a balanced chemical equation, total mass of reactants must be equal to the total mass of products. This is the statement of law of conservation of mass. (iv) (b) (v) (d)

(i) (c) \({ (ii) \ }(b): \ 2 \mathrm{~Pb}\left(\mathrm{NO}_{3}\right)_{2} \longrightarrow 2 \mathrm{PbO}+4 \mathrm{NO}_{2}+\mathrm{O}_{2}\) (iii) (c) : Proteins in our diet get broken down into amino acids. \({ (iv) }(\mathrm{a}): 2 \mathrm{AgCl}_{(\mathbf{s})} \stackrel{\text { Sunlight }}{\longrightarrow} 2 \mathrm{Ag}_{(s)}+\mathrm{Cl}_{2(g)}\) (v) (b): Electrolysis of water is electrolytic decomposition. \(\mathrm{H}_{2} \mathrm{O} \stackrel{\text { Current }}{\longrightarrow} 2 \mathrm{H}_{2}+\mathrm{O}_{2}\)

(I) (b) : H 2 is oxidised to HCI while Cl 2 is reduced to HCl. (ii) (c) \((iii) (c): 2 \mathrm{Fe} \mathrm{Cl}_{3}+\mathrm{H}_{2} \mathrm{~S} \longrightarrow 2 \mathrm{FeCl}_{2}+2 \mathrm{HCl}+\mathrm{s}\) H 2 Sitself gets oxidised to Sand reduces FeCl 3 to FeCI 2 (iv) (a ): ZnO is reduced to Zn and CO is oxidised to CO 2 (v) (b) : H 2 O 2 is reduced to water by removal of oxygen.

\(\text { (i) }(\mathbf{d}): P Q \longrightarrow P+Q\) \(35 \mathrm{~g} \quad \ \ \ 20 \mathrm{~g}+\text { ? }\) According to law of conservation of mass, Mass of PQ = Mass of P + Mass of Q \(\therefore\) Mass of Q = (35 - 20)g = 15 g \({ (ii) \ }(\mathbf{d}): 2 \mathrm{HgO}_{(s)} \longrightarrow 2 \mathrm{Hg}_{(l)}+\mathrm{O}_{2(g)}\) (iii) (b) (iv) (b) (v) (b)

(i) (a) (ii) (d) : Calcium hydroxide is a white colour solid. (iii) (c) : SO 2 is gaseous in nature. (iv) (d) : When copper is heated in the presence of air in a very high temperature, a chemical reaction takes place. Copper reacts with oxygen of the air to form a thin layer of copper oxide on the surface of metallic copper (v) (c) : On burning ofL.P.G., heat is evolved.

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Case Study Questions Class 10 Science Chemical Reactions and Equations

Case study questions class 10 science chapter 1 chemical reactions and equations, cbse case study questions class 10 science chemical reactions and equations, case study 1, case study : 2, case study : 3, case study : 4.

1.) Write the definition of exothermic reaction.

Case Study Questions Class 10 Science Chapter 1 Chemical Reactions and Equations

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CBSE Board Exam is on the way, so you must practice some good Case Studies and Passage Based Questions of Class 10 Science to boost your preparation to score 95+% on Boards. In this post, you will get Case Study and Passage Based Questions that will come in CBSE Class 10 Science Board Exams. These Case Study Questions Class 10 Science are written by experts.

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In CBSE Class 10 Science Paper, Students will have to answer some questions based on Assertion and Reason . There will be a few questions based on case studies and passage-based as well. In that, a paragraph will be given, and then the MCQ questions based on it will be asked.

Chemical Reactions and Equations Case Study Questions With Answers

Here, we have provided case-based/passage-based questions for Class 10 Science Chapter 1 Chemical Reactions and Equations

Case Study/Passage-Based Questions

Question 1:

A chemical reaction is a representation of chemical change in terms of symbols and formulae of reactants and products. There are various types of chemical reactions like combination, decomposition, displacement, double displacement, oxidation, and reduction reactions. Reactions in which heat is released along with the formation of products are called exothermic chemical reactions. All combustion reactions are exothermic reactions.

(i) The chemical reaction in which a single substance breaks down into two or simpler substances upon heating is known as (a) thermal decomposition reaction (b) photodecomposition reaction (c) electric decomposition reaction (d) both (a) and (c)

Answer: (a) The chemical reaction in which a single substance breaks down into two or more simpler substances upon heating is known as thermal decomposition reaction.

(ii) The massive force that pushes the rocket forward through space is generated due to the (a) combination reaction (b) decomposition reaction (c) displacement reaction (d) double displacement reaction

Answer: (b) The massive force that pushes the rocket forward through space is generated due to the decomposition reaction. Hydrogen peroxide decomposes and provides it with a considerable reaction force thrust.

(iii) A white salt on heating decomposes to give brown fumes and the yellow residue is left behind. The yellow residue left is of (a) lead nitrate (b) nitrogen oxide (c) lead oxide (d) oxygen gas

Answer: (c) Lead nitrate decomposes to give brown fumes of nitrogen dioxide gas and yellow residue of lead oxide is left behind.

(iv) Which of the following reactions represents a combination reaction? (a) CaO (s) + H 2 O (l) → Ca(OH) 2 (aq) (b) CaCO 3 (s) → CaO (s) + CO 2 (g) (c) Zn(s) + CuSO 4 (aq) → ZnSO 4 (aq) + Cu(s) (d) 2FeSO 4 (s) → Fe 2 O 3 (s) +SO 2 (g) + SO 3 (g)

Answer: (a) A reaction in which two or more reactants combine to form a single product is known as a combination reaction.

(v) Complete the following statements by choosing correct type of reaction for X and Y. Statement 1: The heating of lead nitrate is an example of ‘X’ reaction. Statement 2: The burning of magnesium is an example of ‘Y’ reaction. (a) X- Combination, Y- Decomposition (b) X- Decomposition, Y-Combination (c) X- Combination, Y-Displacement (d) X- Displacement, Y-Decomposition

Answer: (b) Heating of lead nitrate to form nitrogen dioxide and lead oxide is an example of thermal decomposition reaction and the burning of magnesium ribbon in the air to form magnesium oxide is an example of combination reaction.

Question 2:

In a chemical reaction, reactants are converted into products. The conversion of reactants into products in a chemical reaction is often accompanied by some features which can be observed easily. These easily observed features which take place as a result of chemical reactions are known as characteristics of chemical reactions. Some important characteristics of chemical reactions are: (I) Evolution of heat (II) Formation of a precipitate (III) Change in color (IV) Change in temperature (V) Change in state

Anyone of these general characteristics can tell us whether a chemical reaction has taken place or not.

(i) Reaction of magnesium with air is a/an

(a) exothermic reaction	(b) endothermic reaction
(c) reversible reaction	(d) substitution reaction

Answer: (a) exothermic reaction

(ii) In the following reaction Ca 2+ (aq)+2OH−(aq)⟶Ca(OH) 2 (s)Ca(aq) 2 ++2OH(aq)−⟶Ca(OH) 2 (s) precipitate of calcium hydroxide will be of

(b) blue colour

(d) white colour

Answer: (d) white colour

(iii) In the given reaction, S(s)+O 2 (g)⟶SO 2 S(s)+O 2 (g)⟶SO 2 the physical state of SO 2 is

(a) liquid

(b) solid

(d) all three

Answer: (c) gaseous

(iv) Which one of the following processes involves chemical reactions?

(a) Storing of oxygen gas under pressure in a gas cylinder.

(b) Keeping petrol in a china dish in the open.

(d) Heating copper wire in the presence of air at high temperatures.

Answer: (d) Heating copper wire in the presence of air at high temperature.

(v) In which of the following reactions, high amount of heat energy will be evolved?

(a) Electrolysis of water	(b) Dissolution of NH4Cl in water
(c) Burning of L.P.G.	(d) Decomposition of AgBr in the presence of light

Answer: (c) Burning of L.P.G.

Case Study 3: Chemical reactions and equations are fundamental concepts in chemistry that help us understand the transformation of substances. A chemical reaction involves the rearrangement of atoms to form new substances with different properties. In a chemical equation, the reactants are written on the left side, and the products are written on the right side, separated by an arrow. The number of atoms of each element must be balanced on both sides of the equation. This is achieved by using coefficients to adjust the number of molecules involved in the reaction. Chemical reactions can be classified into various types, such as combination reactions, decomposition reactions, displacement reactions, and redox reactions. Understanding and balancing chemical equations is crucial for studying chemical reactions, predicting the products formed, and analyzing the stoichiometry of reactions.

What do chemical reactions involve? a) Formation of new substances with different properties b) Rearrangement of atoms c) Balancing of equations d) All of the above Answer: d) All of the above

How are reactants and products represented in a chemical equation? a) Reactants on the left side, products on the right side b) Reactants on the right side, products on the left side c) Reactants and products mixed together d) Reactants and products in different equations Answer: a) Reactants on the left side, products on the right side

What must be balanced in a chemical equation? a) Number of molecules b) Number of atoms of each element c) Physical properties of substances d) Coefficients Answer: b) Number of atoms of each element

Which type of chemical reaction involves the breakdown of a compound into simpler substances? a) Combination reaction b) Decomposition reaction c) Displacement reaction d) Redox reaction Answer: b) Decomposition reaction

Why is balancing chemical equations important? a) To predict the products formed in a reaction b) To analyze the stoichiometry of reactions c) To study chemical reactions d) All of the above Answer: d) All of the above

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Class 10 Science: Case Study Chapter 1 Chemical Reactions and Equations PDF Download

Here we are providing you with Class 10 Science Chapter 1 Chemical Reactions and Equations Case Study Questions, by practicing this Case Study and Passage Based Questions will help you in your Class 10th Board Exam.

Case Study Chapter 1 Chemical Reactions and Equations

Question 1:

Answer: (a) The chemical reaction in which a single substance breaks down into two or more simpler substances upon heating is known as thermal decomposition reaction.

(iii) A white salt on heating decomposes to give brown fumes and the yellow residue is left behind. The yellow residue left is of (a) lead nitrate (b) nitrogen oxide (c) lead oxide (d) oxygen gas

Answer: (c) Lead nitrate decomposes to give brown fumes of nitrogen dioxide gas and yellow residue of lead oxide is left behind.

Answer: (a) A reaction in which two or more reactants combine to form a single product is known as a combination reaction.

Question 2:

In a chemical reaction, reactants are converted into products. The conversion of reactants into products in a chemical reaction is often accompanied by some features which can be observed easily. These easily observed features which take place as a result of chemical reactions are known as characteristics of chemical reactions. Some important characteristics of chemical reactions are: (I) Evolution of heat (II) Formation of a precipitate (III) Change in color (IV) Change in temperature (V) Change in state

Anyone of these general characteristics can tell us whether a chemical reaction has taken place or not.

(i) Reaction of magnesium with air is a/an

(a) exothermic reaction	(b) endothermic reaction
(c) reversible reaction	(d) substitution reaction

Answer: (a) exothermic reaction

(ii) In the following reaction Ca 2+ (aq)+2OH−(aq)⟶Ca(OH) 2 (s)Ca(aq) 2 ++2OH(aq)−⟶Ca(OH) 2 (s) precipitate of calcium hydroxide will be of

(b) blue colour

(d) white colour

Answer: (d) white colour

(iii) In the given reaction, S(s)+O 2 (g)⟶SO 2 S(s)+O 2 (g)⟶SO 2 the physical state of SO 2 is

(a) liquid

(b) solid

(d) all three

Answer: (c) gaseous

(iv) Which one of the following processes involves chemical reactions?

(a) Storing of oxygen gas under pressure in a gas cylinder.

(b) Keeping petrol in a china dish in the open.

(d) Heating copper wire in the presence of air at high temperatures.

Answer: (d) Heating copper wire in the presence of air at high temperature.

(v) In which of the following reactions, a high amount of heat energy will be evolved?

(a) Electrolysis of water	(b) Dissolution of NH4Cl in water
(c) Burning of L.P.G.	(d) Decomposition of AgBr in the presence of light

Answer: (c) Burning of L.P.G.

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Case Based Questions for Ch 1 Chemical Reactions and Equations Class 10 Science

(i) The massive force that pushes the rocket forward through space is generated due to the

(a) combination reaction

(b) decomposition reaction

(d) double displacement reaction

(ii) A white salt on heating decomposes to give brown fumes and yellow residue is left behind. The yellow residue left is of

(a) lead nitrate

(b) nitrogen oxide

(d) oxygen gas

(iii) Which of the following reactions represents a combination reaction?

(a) CaO (s) + H 2 O (l) ⟶ Ca(OH) 2 (aq)

(b) CaCO 3 (s) ⟶ CaO (s) + CO 2 (g)

(d) 2FeSO 4 (s) ⟶ Fe 2 O 3 (s) + SO 2 (g) + SO 3 (g)

(iv) Complete the following statements by choosing correct type of reaction for X and Y.

Statement 1: The heating of lead nitrate is an example of ‘X’ reaction.

Statement 2: The burning of magnesium is an example of ‘Y’ reaction.

(a) X-Combination, Y-Decomposition

(b) X-Decomposition, Y-Combination

(d) X- Displacement, Y-Decomposition

Lead nitrate decomposes to give lead oxide and nitrogen oxide. Thus, X is a decomposition reaction.

2Pb(NO 3 ) 2 (s) ⟶ 2PbO(s) + 4NO 2 (g)

Magnesium burns in the presence of oxygen gas to magnesium oxide. Thus, Y is a combination reaction.

2Mg + O 2 ⟶ 2MgO

(b) combustion

(d) photosynthesis

(ii) Which of the following is essential for photosynthesis?

(a) Sunlight

(b) Chlorophyll

(d) Both 'a' and 'b’

(iii) When a chemical compound decomposes on absorbing light and energy, then the reaction which takes place is known as:

(a) photosynthesis

(b) photodecomposition

(d) thermal decomposition

(iv) Which of the following reactions is an example of combustion reaction?

(a) C(s) + O 2 (g) ⟶ CO 2 (g)

(b) Zn(s) + H 2 SO 4 (aq) ⟶ ZnSO 4 + H 2 (g)

(d) 3Mg(s) + N 2 (g) ⟶ Mg 3 N 2 (s)

(v) Which of the following is an example of combination reaction?

(a) H 2 + Cl 2 ⟶ 2HCl

(b) Fe + S ⟶ FeS

(d) All of them

Photosynthesis is the process by which green plants and some other organisms use sunlight to synthesis nutrients from carbon dioxide and water.

(iii) (b) photodecomposition

A combustion reaction is a reaction in which a substance reacts with oxygen gas, releasing energy in the form of light and heat.

(v) (d) All of them

The values of x and y are:

(a) 3 and 5

(b) 8 and 6

(d) 7 and 1

(ii) What happens when copper rod is dipped in iron sulphate solution:

(a) Copper displaces iron

(b) Blue colour of copper sulphate solution is obtained

(d) Reaction is exothermic

(iii) A substance which oxidised itself and reduces other is known as:

(a) Oxidising agent

(b) Reducing agent

(d) None of these

(iv) Fe 2 O 3 + 2Al ⟶ Al 2 O 3 + 2Fe

The above reaction is an example of a:

(a) Combination reaction

(b) Double displacement reaction

(d) Displacement reaction

(v) Name the products formed when iron filings are heated with dilute hydrochloric acid.

(a) Fe (III) chloride and water

(b) Fe (II) chloride and water

(d) Fe (III) chloride and hydrogen gas

After balancing the equation, we get

Cu + 4HNO 3 ⟶ Cu(NO 3 ) 2 + 2NO 2 + 2H 2 O

(ii) (c) No reaction takes place.

(iii) (b) Reducing agent

Reducing agents reduce the other substance and in turn, get oxidized.

(iv) (d) Displacement reaction

(v) (c) Fe (II) chloride and hydrogen gas

When dilute Hydrochloric acid is added to iron filings, iron chloride & hydrogen gas is produced.

Fe + 2HCl ⟶ FeCl 2 + H 2

The iron displaces hydrogen from hydrochloric acid to form iron (II) chloride & hydrogen gas. This is a single displacement reaction.

(a) bleaching agent in the textile, paper and jute industry

(b) disinfectant for water to make water free of germs

(d) all of these

(ii) Bleaching powder is also known as:

(a) calcium oxychloride

(b) calcium hypochlorite

(iii) Bleaching powder gives smell of chlorine because it:

(a) is unstable

(b) gives chlorine on exposure to atmosphere

(d) contains excess of chlorine.

(iv) Select the correct statement(s) regarding bleaching powder.

(a) It is pale yellow powder having smell of chlorine.

(b) It is sparingly soluble in water and gives milky suspension when dissolved in water.

(d) All of these.

(v) Identify the product ‘X’ in the given reaction.

Ca(OH) 2 + Cl 2 ⟶ X + H 2 O

(a) CaOCl 2

Bleaching powder gives chlorine on exposure to air by reacting with CO 2 .

CaOCl 2 + CO 2 ⟶ CaCO 3 + Cl 2

Ca(OH) 2 + Cl 2 ⟶ CaOCl 2 + H 2 O

CaOCl 2 : calcium oxychloride (bleaching powder)

(i) Rancidity can be prevented by:

(a) adding antioxidants

(b) packaging oily food in nitrogen gas

(d) none of these.

(ii) Combination of phosphorus and oxygen is an example of:

(a) oxidation

(b) reduction

(d) none of these

(iii) A science teacher wrote the following statements about rancidity:

(I) When fats and oils are reduced, they become rancid.

(II) In chips packet, rancidity is prevented by oxygen.

(III) Rancidity is prevented by adding antioxidants.

Select the correct option

(a) (I) only

(b) (II) and (III) only

(d) (I), (II) and (III)

(iv) Two statements are given below regarding rusting of iron.

(I) The rusting of iron is a redox reaction and reaction occurs as,

4Fe + 3O 2 ⟶ 4Fe 3+ + 6O 2–

(II) The metallic iron is oxidised to Fe 2+ and O 2 is reduced to O 2– .

Select the correct statement(s).

(b) II only

(v) Which of the following measures can be adopted to prevent or slow down rancidity?

(I) Food materials should be packed in air tight container.

(II) Food should be refrigerated.

(III)Food materials and cooked food should be kept away from direct sunlight.

(a) Only II and III

(b) Only I and III

(d) I, II and III

Antioxidants and nitrogen gas prevent oxidation of food.

(ii) (a) oxidation

4P + 3O 2 ⟶ 2P 2 O 3 ,

4P + 5O 2 ⟶ 2P 2 O 5

(iii) (III) only

The oils and fats are slowly oxidised to certain bad smelling compounds, which release foul smell. This is known as rancidity. Rancidity is prevented by filling nitrogen gas in chips packets.

(iv) (a) I only

(v) (d) I, II and III

(i) Consider the following reaction:

pMg 3 N 2 + qH 2 O ⟶ rMg(OH) 2 + sNH 3

When the equation is balanced, the coefficients p, q, r, s respectively are:

(a) 1, 3, 3, 2

(b) 1, 6, 3, 2

(d) 2, 3, 6, 2

(ii) Which of the following information is not conveyed by a balanced chemical equation?

(a) Physical states of reactants and products

(b) Symbols and formulae of all the substances involved in a particular reaction

(d) Whether a particular reaction is actually feasible or not

(iii) The balancing of chemical equations is in accordance with

(a) law of combining volumes

(b) law of constant proportions

(d) both (b) and (c)

(iv) Which of the following chemical equations is an unbalanced one?

(a) 2NaHCO 3 ⟶ Na 2 CO 3 + H 2 O + CO 2

(b) 2C 4 H 10 + 12O 2 ⟶ 8CO 2 + 10H 2 O

(d) 4NH 3 + 5O 2 ⟶ 4NO + 6H 2 O

(v) Which of the following statements is/are correct?

(a) A chemical equation tells us about the substances involved in a reaction.

(b) A chemical equation informs us about the symbols and formulae of the substances involved in a reaction.

(d) All the above.

(i) (b) 1, 6, 3, 2

Mg 3 N 2 + 6H 2 O ⟶ 3Mg(OH) 2 + 2NH 3

(ii) (d) Whether a particular reaction is actually feasible or not

(iii) (c) law of conservation of mass

In a balanced chemical equation, total mass of reactants must be equal to the total mass of products. This is the statement of law of conservation of mass.

(iv) (b) 2C 4 H 10 + 12O 2 ⟶ 8CO 2 + 10H 2 O

(v) (d) All the above.

(i) Which of the following is a redox reaction?

(a) CaCO 3 ⟶ CaO + CO 2

(b) H 2 + Cl 2 ⟶ 2HCl

(d) NaOH + HCl ⟶ NaCl + H 2 O

(ii) Identify the reaction in which H2O2 is acting as a reducing agent.

(a) H 2 SO 3 + H 2 O 2 ⟶ H 2 SO 4 + H 2 O

(b) 2HI + H 2 O 2 ⟶ 2H 2 O + I 2

(d) 2FeCl 2 + 2HCl + H 2 O 2 ⟶ 2FeCl 3 + 2H 2 O

(iii) For the following reactions, identify the one in which H2S acts as a reducing agent.

(a) CuSO 4 + H 2 S ⟶ CuS + H 2 SO 4

(b) Cd(NO 3 ) 2 + H 2 S ⟶ CdS + 2HNO 3

(iv) For the following reaction, identify the correct statement.

ZnO + CO ⟶ Zn + CO 2

(a) ZnO is being reduced.

(b) CO 2 is being oxidised.

(d) ZnO is being oxidised.

(v) In the following reaction, which substance is reduced?

Pbs + 4H 2 O 2 ⟶ PbSO 4 + 4H 2 O

(b) H 2 O 2

(i) (b) H 2 + Cl 2 ⟶ 2HCl

H 2 is oxidised to HCl while Cl 2 is reduced to HCl.

(ii) (c) Cl 2 + H 2 O 2 ⟶ 2HCl + O 2

(iii) (c) 2FeCl 3 + H 2 S ⟶ 2FeCl 2 + 2HCl + S

H 2 S itself gets oxidised to S and reduces FeCl 3 to FeCl 2 .

(iv) (a) ZnO is being reduced. ZnO is reduced to Zn and CO is oxidised to CO 2 .

(v) (b) H 2 O 2 is reduced to water by removal of oxygen.

(I) Evolution of heat

(II) Formation of precipitate

(III) Change in colour

(IV) Change in temperature

(V) Change in state

Any one of these general characteristics can tell us whether a chemical reaction has taken place or not.

(i) Reaction of magnesium with air is a/an:

(a) exothermic reaction

(b) endothermic reaction

(d) substitution reaction

(ii) In the following reaction,

Ca 2+ (aq) + 2OH - (aq) ⟶ Ca(OH) 2 (s)

precipitate of calcium hydroxide will be of:

(a) green colour

(b) blue colour

(d) white colour.

(iii) In the given reaction,

S(s) + O 2 (g) ⟶ SO 2

the physical state of SO 2 is

(d) all three.

(iv) Which one of the following processes involve chemical reactions?

(a) Storing of oxygen gas under pressure in a gas cylinder.

(b) Keeping petrol in a china dish in the open.

(d) Heating copper wire in the presence of air at high temperature.

(v) In which of the following reactions, high amount of heat energy will be evolved?

(a) Electrolysis of water

(b) Dissolution of NH 4 Cl in water

(d) Decomposition of AgBr in the presence of light.

(i) (a) exothermic reaction

(ii) (d) white colour.

Calcium hydroxide is a white colour solid.

(iii) (c) gaseous

SO 2 is gaseous in nature.

(iv) (d) Heating copper wire in the presence of air at high temperature.

When copper is heated in the presence of air in a very high temperature, a chemical reaction takes place. Copper reacts with oxygen of the air to form a thin layer of copper oxide on the surface of metallic copper.

(v) (c) Burning of L.P.G.

On burning of L.P.G., heat is evolved.

(i) Copper displaces which of the following metals from its salt solution?

(ii) When zinc reacts with dilute sulphuric acid, the gas evolved is

(a) red in colour and have a sweet smelling.

(b) green in colour and have a foul smell.

(d) colourless, pungent smelling and burns with a pop sound.

(iii) When dry hydrogen is passed over a heated oxide of metal X using the apparatus shown below, a reddish-brown residue is obtained.

The reddish-brown residue could be

(iv) Which of the following reactions is a displacement reaction?

(a) CaO + H 2 O ⟶ Ca(OH) 2

(b) MgCO 3 ⟶ Mg + CO 2

(d) H 2 + Cl 2 ⟶ 2HCl

(v) When dilute hydrochloric acid is added to granulated zinc placed in a test tube, the observation made is

(a) the surface of the metal turns shining

(b) the reaction mixture turns milky

(d) the colourless and odourless gas evolves burns with a pop sound.

(i) (c) AgNO 3

Cu + 2AgNO 3 ⟶ Cu(NO 3 ) 2 + 2Ag

Copper can displace silver from its salt solution since, copper is more reactive than silver.

(ii) (c) colourless, odourless and burns with a pop sound.

Zn + H 2 SO 4 (dil.) ⟶ ZnSO 4 + H 2 ↑

H 2 is a colourless, odourless gas and burns with a pop sound.

(iii) (a) Copper is the reddish-brown residue as shown in below reaction.

(iv) (c) Mg + CuSO 4 ⟶ MgSO 4 + Cu

It is a single displacement reaction.

(v) (d) the colourless and odourless gas evolves burns with a pop sound.

Hydrogen gas is evolved in this reaction as shown in the reaction.

Zn + 2HCl ⟶ ZnCl 2 + H 2 ↑

Hydrogen gas is colourless and odourless which burns with a pop sound.

Those reactions in which two compounds react by an exchange of ions to form two new compounds are called double displacement reactions. A double displacement reaction usually occurs in solution and one of the products, being insoluble, precipitate out (separates as a solid). Any reaction in which an insoluble solid (called precipitate) is formed that separates from the solution is called a precipitation reaction. The reaction in which acid or acidic oxide reacts with base or basic oxide to form salt and water is called neutralisation reaction.

For example, 2NaOH + H 2 SO 4 ⟶ Na 2 SO 4 + H 2 O

(i) When hydrogen sulphide gas is passed through a blue solution of copper sulphate, a black precipitate of copper sulphide is obtained and the sulphuric acid so formed remains in the solution. The reaction is an example of a:

(b) displacement reaction

(ii) Which of the following is not a double displacement reaction?

(a) AgNO 3 (aq) + NaCl(aq) ⟶ AgCl(s) + NaNO 3 (aq)

(b) Zn(s) + H 2 SO 4 (aq) ⟶ ZnSO 4 (aq) + H 2 (g)

(d) Pb(NO 3 ) 2 (aq) + 2KI (aq) ⟶ PbI 2 (s) + 2KNO 3 (aq)

(iii) Barium chloride on reaction with ammonium sulphate forms barium sulphate and ammonium chloride. Which of the following correctly represents the type of the reaction involved?

(I) Displacement reaction

(II) Precipitation reaction

(III) Combination reaction

(IV) Double displacement reaction

(b) (II) only

(d) (II) and (IV) only

(iv) Identify A in the following reaction.

AlCl 3 (aq) + 3NH 4 OH(aq) ⟶ A + 3NH 4 Cl(aq)

(a) Al(OH) 3

(b) Al 2 O 3

(v) Consider the following reaction,

BaCl 2 + Na 2 SO 4 ⟶ BaSO 4 + 2NaCl

Identify the precipitate in the reaction.

(i) (d) double displacement reaction

CuSO 4 + H 2 S ⟶ CuS + H 2 SO 4

Both CuSO 4 and H 2 S exchange their ions to give new compounds- CuS and H 2 SO 4 . Hence, this is a double displacement reaction.

(ii) (b) Zn(s) + H 2 SO 4 (aq) ⟶ ZnSO 4 (aq) + H 2 (g)

It is an example of single displacement reaction.

(iii) (d) (II) and (IV) only

BaCl 2 + (NH 4 ) 2 SO 4 ⟶ BaSO 4 ↓ + 2NH 4 Cl

(BaSO 4 : white ppt.)

It is a precipitation reaction as well as double displacement reaction.

(iv) (a) Al(OH) 3

AlCl 3 + 3NH 4 OH ⟶ Al(OH) 3 + 3NH 4 Cl

(v) (b) BaSO 4

BaCl 2 (aq) + Na 2 SO 4 (aq) ⟶ BaSO 4 (s) ↓ + 2NaCl(aq)

(i) A redox reaction is one in which:

(a) both the substances are reduced

(b) both the substances are oxidized

(d) one substance is oxidised while the other is reduced.

(ii) In the reaction, H 2 S + Cl 2 ⟶ S + 2HCI

(a) H 2 S is the reducing agent.

(b) HCl is the oxidising agent.

(d) Cl 2 is the reducing agent.

(iii) Which of the following processes does not involve either oxidation or reduction?

(a) Formation of slaked lime from quick lime.

(b) Heating mercuric oxide.

(d) Formation of zinc from zinc blend.

(iv) Mg + CuO ⟶ MgO + Cu

Which of the following is wrong relating to the above reaction?

(a) CuO gets reduced.

(b) Mg gets oxidised.

(d) It is a redox reaction.

(v) Identify the correct oxidising agent and reducing agent in the following reaction.

Fe 2 O 3 + 2AI ⟶ 2Fe + Al 2 O 3

(a) Al - Oxidising agent, Fe 2 O 3 - Reducing agent

(b) Fe 2 O 3 - Oxidising agent, Al - Reducing agent

(b) Fe 2 O 3 - Oxidising agent, Al 2 O 3 - Reducing agent

(i) (d) one substance is oxidised while the other is reduced.

In a redox reaction, one reactant is reduced while other reactant is oxidised.

(ii) (a) H 2 S is the reducing agent.

(iii) (a) Formation of slaked lime from quick lime

It is a decomposition reaction.

(iv) (c) CuO gets oxidised.

Addition of oxygen is called oxidation while the removal of oxygen is called reduction.

Thus, Mg gets oxidised and CuO gets reduced and it is a redox reaction.

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Carbon and its Compounds
Periodic Classification of Elements (Not in Syllabus)

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CBSE Class 10

CBSE Class 10 Chemistry Chapter 1 Important Questions and Answers for 2023

Cbse class 10 chemistry chapter 1 important questions: in this article, we are going to discuss the important questions of cbse class 10 chemistry chapter 1 chemical reactions and equations for 2023 class 10th board examination. the answers are also given towards the end. download solutions in pdf. .

CBSE Class 10 Chemistry Chapter 1 Important Questions: Central Board of Secondary Education is likely to release the 2023 class 10th board examination date sheet soon. The board has not yet announced a fixed date for the release of the date sheet.

The board exams are likely to commence in February, 2023.

With about two months left for CBSE Class 10 Science board examinations, students should begin their preparations if they haven’t already done so.

CBSE Class 10 Chemistry Chapter 1 Important Questions:

Chapter 1 chemical reactions and equations, multiple choice questions.

When Ag is exposed to air it gets a black coating of

(a) AgNO3

(b) Ag2S

Which of the reactions is used in black and white photography?

(a) Combination Reaction

(b) Decomposition Reaction

(d) Oxidation reaction

Identify the substance oxidized in the above equation.

(a) MnCl2

(b) HCl

Zinc reacts with silver nitrate to form which compounds?
In the double displacement reaction between aqueous potassium iodide and aqueous lead nitrate, a yellow precipitate of lead iodide is formed. While performing the activity if lead nitrate is not available, which of the following can be used in place of lead nitrate?
a) Lead sulphate (insoluble)

(b) Lead acetate

The brown gas evolved on heating of copper nitrate is

(a) O2

(b) NO2

Electrolysis of water is a decomposition reaction. The mole ratio of hydrogen and oxygen gases liberated during electrolysis of water is:

(a) 1: 1

(b) 2:1

A substance ‘X’ is used in white-washing and is obtained by heating limestone in the absence of air. Identify ‘X’.

(a) CaOCl2

(b) Ca (OH)2

2HNO3 + Ca (OH)2 → Ca (NO3)2 + 2H2O; is an example of

(i) displacement reaction

(ii) double displacement reaction

(iii) neutralisation reaction

(iv) combination reaction.

(a) (i) and (ii)

(b) (ii) and (iii)

A substance X which is a group 2 element is used intensively in the cement industry. This element is present in bones also. On treatment with water, it forms a solution which turns red litmus blue. Element X is

(a) Cu

(b) Ca

(c)Na

ASSERTION- REASON TYPE QUESTIONS

DIRECTION : Each of these questions contains an assertion followed by reason. Read them carefully and answer the question on the basis of following options. You have to select the one that best describes the two statements.

(a) If both Assertion and Reason are correct and reason is the correct explanation of Assertion.

(b) If both Assertion and Reason are correct, but reason is not the correct explanation of Assertion.

(d) If Assertion is incorrect but Reason is correct.

Q1. Assertion (A): Photosynthesis is considered as an endothermic reaction.

Reason (R): Energy gets released in the process of photosynthesis

Q2. Assertion (A): MnO2 + 4HCl → MnCl2 + Cl2 + 2H2O is redox reaction.

Reason (R): MnO2 oxidises HCl to Cl2 and gets reduced to MnCl2.

Q3. Assertion (A): When HCl is added to zinc granules, a chemical reaction occurs.

Reason (R): Evolution of a gas indicates that the chemical reaction is taking place.

Q4. Assertion (A): White silver chloride turns grey in sunlight.

Reason (R): Decomposition of silver chloride in presence of sunlight takes place to form silver metal and chlorine gas.

Q5. Assertion (A): Chemical reaction changes the physical and chemical properties of a substance

These practise papers will not just boost your Chemistry preparation but also help you in analysing what your weak points are.

CASE STUDY QUESTIONS

A chemical reaction is a representation of chemical change in terms of symbols and formulae of reactants and products. There are various types of chemical reactions like combination, decomposition, displacement, double displacement, oxidation and reduction reactions. Reactions in which heat is released along with the formation of products are called exothermic chemical reactions. All combustion reactions are exothermic reactions.

(i) The massive force that pushes the rocket forward through space is generated due to the

(a) combination reaction

(b) decomposition reaction

(d) double displacement reaction

(ii) A white salt on heating decomposes to give brown fumes and yellow residue is left behind. The yellow residue left is of

(a) lead nitrate

(b) nitrogen oxide

(d) oxygen gas

(iii) Which of the following reactions represents a combination reaction?

(a) CaO (s) + H2O (l) → Ca (OH)2 (aq)

(b) CaCO3 (s) → CaO (s) + CO2(g)

(d) 2FeSO4(s) → Fe2O3 (s) +SO2(g) + SO3(g)

(iv) Complete the following statements by choosing correct type of reaction for X and Y.

Statement 1: The heating of lead nitrate is an example of ‘X’ reaction.

Statement 2: The burning of magnesium is an example of ‘Y’ reaction.

(a)X-Combination,Y-Decomposition

(b)X-Decomposition,Y-Combination

(c)X-Combination,Y-Displacement

Those reactions in which two compounds react by an exchange of ions to form two new compounds are called double displacement reactions. A double displacement reaction usually occurs in solution and one of the products, being insoluble, precipitate out (separates as a solid). Any reaction in which an insoluble solid (called precipitate) is formed that separates from the solution is called a precipitation reaction. The reaction in which acid or acidic oxide reacts with base or basic oxide to form salt and water is called neutralisation reaction.

For example, 2NaOH+H2SO4⟶Na2SO4 + 2 H2O

(i) When hydrogen sulphide gas is passed through a blue solution of copper sulphate, a black precipitate of copper sulphide is obtained, and the sulphuric acid so formed remains in the solution. The reaction is an example of a

(a) combination reaction

(b) displacement reaction

(ii) Barium chloride on reaction with ammonium sulphate forms barium sulphate and ammonium chloride. Which of the following correctly represents the type of the reaction involved?

(I) Displacement reaction

(II) Precipitation reaction

(III) Combination reaction

(IV) Double displacement reaction

(a) (I) only

(b) (II) only

(d) (II) and ( V) only

(iii) Identify A in the following reaction.

AlCl3(aq) + 3NH4OH (aq)⟶A + 3NH4Cl(aq)

(a) Al (OH)3

(b) Al2 O3

(iv) Consider the following reaction, BaCl2 + Na2SO4⟶ BaSO4 + 2NaCl. Identify the precipitate in the reaction,

(a) BaCl2

(b) BaSO4

Short Answer Type Questions-I (2 Marks)

You might have noted that when copper powder is heated in a China dish, the reddish brown surface of copper powder becomes coated with a black substance.

(a) Why is this black substance formed?

(b) What is the black substance?

Define a combination reaction. Give one example of a combination reaction which is also exothermic.

(a) A solution of potassium chloride when mixed with silver nitrate solution, an insoluble white substance is formed. Write the chemical reaction involved and also mention the type of the chemical reaction.

(b) Ferrous sulphate when heated, decomposes with the evolution of a gas having a characteristic odour of burning sulphur. Write the chemical reaction involved and identify the type of reaction.

What is observed when carbon dioxide gas is passed through lime water.

(i) For a short duration

(ii) For long duration?

Also, write the chemical equations for the reaction involved.

Lead nitrate solution is added to a test tube containing potassium iodide solution.

(a) Write the name and colour of the compound precipitated.

(b) Write the balanced chemical equation for the reaction involved.

Name the type of chemical reaction represented by the following equation:

(Board Term I, 2016)

(i) CaO + H2O → Ca(OH)2

(ii) 3BaCl2 + Al2(SO4)3 → 2AlCl3 + 3BaSO4

2 g of silver chloride is taken in a China dish and the China dish is placed in sunlight for some time. What will be your observation in this case? Write the chemical reaction involved in the form of a balanced chemical equation. Identify the type of chemical reaction.
List four observations that help us to determine whether a chemical reaction has taken place.
Identify the type of reactions taking place in each of the following cases and write the balanced chemical equation for the reactions.

(a) Zinc reacts with silver nitrate to produce zinc nitrate and silver.

(b) Potassium iodide reacts with lead nitrate to produce potassium nitrate and lead iodide.

i) Can a displacement reaction be a redox reaction? Explain with the help of an
ii) Identify the substances that are oxidised and the substances that are reduced in the

following reactions.

(Board Term I, 2015)

(a) Fe2O3 + 2Al → Al2O3 + 2Fe

(b) 2PbO + C → 2Pb + CO2

Also check:

CBSE Class 10 Science Syllabus 2022-23

Answers to CBSE Class 10 Chemistry Chapter 1 Important Questions:

DOWNLOAD: Answers to CBSE Class 10 Chemistry Chapter 1 Important Questions

The massive force that pushes the rocket forward through space is generated due to the decomposition reaction. Hydrogen peroxide decomposes and provides it with a considerable reaction force thrust.

ii) (c)

Lead nitrate decomposes to give brown fumes of nitrogen dioxide gas and yellow residue of lead oxide is left behind.

iii) (a)

CBSE Class 10 Chemistry Chapter 1 Section D Important Question Answer

2. A combination reaction is said to have occurred when two or more than two substances combine to form a single substance. CaO + H 2 O → Ca(OH) 2

4. (i) For short duration: Limewater turns milky due to the formation of CaCO3, Which is insoluble in water. CaOH 2 + Co 2 → CaCo 3 + H 2 O

(ii) For Long duration: A clear solution is obtained due to the formation of calcium bicarbonate. Ca (HCO3)2 which is soluble in water. CaCO 3 + H 2 O → Ca(HCO 3 ) 2

5. (a) When lead nitrate is added to potassium iodide then yellow precipitate of lead iodide is formed along with potassium nitrate.

(b) Balanced chemical reaction is as follows : Pb(NO 3 ) 2 + 2KI → PbI 2 + 2KNO 3

6. (i) Combination reaction.

(ii) Precipitation reaction or double displacement reaction.

(iii) Thermal decomposition reaction.

7. When 2 g of silver chloride is taken in a china dish and the china dish is placed in sunlight for some time, the white sodium chloride turns grey due to the decomposition reaction through the sunlight that decomposes silver chloride into silver and chlorine by light. 2 AgCl (s) → 2 Ag (s) + Cl 2 (g)

8. (i) Evolution of gas

(ii) Change in temperature

(iii) Change in state

(iv) Change in colour

(i) Consider the following displacement reaction: Zn(s)+ CuSO4(aq) → ZnSO4(aq) + Cu(s) Here, Zn has changed into ZnSO4 (i.e., Zn2+ ions) by loss of electrons. Hence, Zn has been oxidised. CuSO4 (i.e., Cu2+) has changed into Cu by gain of electrons. Hence, CuSO4 has been reduced. Thus, the above reaction is a displacement reaction as well as a redox reaction.

CBSE Class 10 Chemistry Chapter 2 Important Questions and Answers for 2023

CBSE Class 10 Chemistry Chapter 3 Important Questions and Answers for 2023

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CBSE NCERT Solutions

NCERT and CBSE Solutions for free

Case Study Chapter 1 Chemical Reactions and Equations

Please refer to Chapter 1 Chemical Reactions and Equations Case Study Questions with answers provided below. We have provided Case Study Questions for Class 10 Science for all chapters as per CBSE, NCERT and KVS examination guidelines. These case based questions are expected to come in your exams this year. Please practise these case study based Class 10 Science Questions and answers to get more marks in examinations.

Case Study Questions Chapter 1 Chemical Reactions and Equations

Case/Passage – 1 The reaction between MnO 2 with HCl is depicted in the following diagram. It was observed that a gas with bleaching abilities was released .

Case Study Chapter 1 Chemical Reactions and Equations

Question: Identify the correct statement from the following: (a) MnO2 is getting reduced whereas HCl is getting oxidized (b) MnO2 is getting oxidized whereas HCl is getting reduced. (c) MnO2 and HCl both are getting reduced. (d) MnO2 and HCl both are getting oxidized.

Question: Chlorine gas reacts with _____ to form bleaching powder. (a) dry Ca(OH) 2 (b) dil. solution of Ca(OH) 2 (c) conc. solution of Ca(OH) 2 (d) dry CaO

Question: In the above discussed reaction, what is the nature of MnO2? (a) Acidic oxide (b) Basic oxide (c) Neutral oxide (d) Amphoteric oxide

Question: The chemical reaction between MnO2 and HCl is an example of: (a) displacement reaction (b) combination reaction (c) redox reaction (d) decomposition reaction.

Question: What will happen if we take dry HCl gas instead of aqueous solution of HCl? (a) Reaction will occur faster. (b) Reaction will not occur. (c) Reaction rate will be slow. (d) Reaction rate will remain the same.

Case/Passage – 2

Chemistry in Automobiles: For an internal combustion engine to move a vehicle down the road, it must convert the energy stored in the fuel into mechanical energy to drive the wheels. In your car, the distributor and battery provide this starting energy by creating an electrical “spark”, which helps in combustion of fuels like gasoline. Below is the reaction depicting complete combustionof gasoline in full supply of air: 2C 8 H 18 (I) + 25O 2 (g) → 16 ‘X’ + Y Question: Which of the following are the products obtained from the reaction mentioned in the above case? Product ‘ X’ Product ‘Y’ (a) CO 2 H 2 O 2 (b) H 2 O CO (c) CH 3 OH H 2 O (d) CO 2 H 2 O

Question: On the basis of evolution/absorption of energy, which of the following processes are similar to combustion of fuel? (i) Photosynthesis in plants (ii) Respiration in the human body (iii) Decomposition of vegetable matter (iv) Decomposition of ferrous sulphate. (a) (ii) & (iii) (b) (i) & (ii) (c) (iii) & (iv) (d) (ii) & (i)

Question: ‘Although nitrogen is the most abundant gas in the atmosphere, it does not take part in combustion’. Identify the correct reason for this statement. (a) Nitrogen is a reactive gas (b) Nitrogen is an inert gas (c) Nitrogen is an explosive gas (d) Only hydrocarbons can take part in combustion

Question: Identify the types of chemical reaction occurring during the combustion of fuel: (a) Oxidation & Endothermic reaction (b) Decomposition & Exothermic reaction (c) Oxidation & Exothermic reaction (d) Combination & Endothermic reaction

Question: ‘A student while walking on the road observed that a cloud of black smoke belched out from the exhaust stack of moving trucks on the road.’ Choose the correct reason for the production of black smoke: (a) Limited supply of air leads to incomplete combustion of fuel. (b) Rich supply of air leads to complete combustion of fuel. (c) Rich supply of air leads to a combination reaction. (d) Limited supply of air leads to complete combustion of fuel.

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Class 10 Science Chapter 1 Chemical Reactions and Equations

The chemical equation and reaction class 10 NCERT textbook's first chapter approximately carries 9 marks in the final exam. CBSE has included this chapter to make students understand the chemical changes happening around us. Students get to learn how to balance chemical equations and what changes occur in the environment under varying conditions.

This class 10 science 1st chapter subject-wise material page includes all the right study material to help students under the chapter better and to be able to create the foundation for understanding chemical reactions in detail. On this page, you will find chapter-wise notes, DoE worksheets, experiential activities, and many more subject-wise material.

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CBSE Class 10 Chemical Reactions Notes

Below, we have provided the links to downloadable PDFs of science ch 1 notes and that too for different categories of marks.

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CBSE Class 10 Chemical Reactions DoE Worksheet

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<red> ➜ <red>Worksheet 1

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Below, we have provided the links to downloadable PDFs of Experiential Learning Activity for class 10 Science to help students implement their acquired knowledge in the real world.

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Cbse class 10 chemical reactions important questions.

Below, we have provided Class 10 Science Important Questions that cover all the important questions in chemical reactions and equations.

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Cbse class 10 chemical reactions mind maps.

Below, we have provided Class 10 Science Mind maps that include mind maps of the related concepts in chemical reactions and equations.

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Cbse class 10 chemical reactions question bank.

Below, we have provided Class 10 Science Question Banks that cover every typology question with detailed explanations from various resources in one place.

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Below, we have provided Class 10 Science Support Materials that cover Case Study-based questions from the various concepts explained in Science NCERT chapters.

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Why download these chapter-wise pdfs.

The downloadable links for the chemical reactions and equations class 10 science chapter 1 have been given above to boost students’ exam preparation with the right study material. The diagrams, tables, and graphs help us grasp the concepts easily since our brains can process visuals faster than written concepts.

These chapter-wise PDFs include all important points and concepts in an easy-to-understand language.
The PDFs are designed while keeping the revised CBSE pattern in mind to keep students prepared as per the latest syllabus.
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How Can This Chapter-wise Material Help Students?

The chapter-wise material for class 10 science 1st chapter will help in preparing the chapter from the NCERT textbook along with the additional right study material. After downloading chapter notes, DoE worksheets, question banks, important questions, and many other study materials, students can prepare for the chapter effectively.

The class 10 science chapter 1 notes cover the chapter comprehensively and include all the important points and concepts. Students can understand the chapter better and in detail.
Mind maps created will help students connect the concepts of what they have learned. It will help significantly in aligning your already existing knowledge with the newly acquired knowledge thus improving the understanding of the chapter.
The DoE worksheets and question banks can help in preparing every typology included in the 10th board exams. Students can prepare a timetable and practice related questions after they have thoroughly understood the concept.
The Class 10 CBSE important questions include not only the must-prepare concept questions for the exam but the recurring questions also. Practicing important questions will increase the likelihood of scoring better marks on the exam.

At Educart, we have provided these questions and other support materials, so teachers can help the students practice these types of questions thoroughly. These PDFs can be downloaded just with a click and user authentication.

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NCERT Solutions for Class 10 Science Chapter 1 Chemical Reactions and Equations

Study Reference for Class 10 Chapter 1 Chemical Reactions and Equations

Chapter 1 Chemical Reactions and Equations Class 10 NCERT Solutions

Ncert solutions for class 10 science chapters:.

State the law which is kept in mind while we balance a chemical equation.

What is basic difference between a physical change and a chemical change, what is meant by a chemical reaction, is burning of a candle, a physical change or a chemical change, why are decomposing reactions called the opposite of combination reactions, contact form.

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HOTS Questions for Class 10 Science Chapter 1 Chemical Reactions and Equations

July 23, 2018 by Prasanna

These Solutions are part of HOTS Questions for Class 10 Science . Here we have given HOTS Questions for Class 10 Science Chapter 1 Chemical Reactions and Equations

Question 1. Study the given diagram and answer the following questions : (a) Write the chemical reaction involved in the process. (b) Mention the colour of :

copper powder and
the substance formed after heating it.

HOTS Questions for Class 10 Science Chapter 1 Chemical Reactions and Equations image - 1

Copper powder is brownish in colour.
The substance formed after heating is cupric oxide. It has black colour.

(c) The reaction can be reversed by heating cupric oxide in a current of hydrogen. CuO(s) + H 2 (g) ———–> Cu (s) + H 2 O(g) In this reaction, H 2 undergoes oxidation to H 2 O and CuO is reduced to Cu.

More Resources

HOTS Questions for Class 10 Science
NCERT Solutions for Class 10 Science
Value Based Questions in Science for Class 10
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Previous Year Question Papers for CBSE Class 10 Science

Question 4. (a) Based on the reactions given below, arrange the metals involved in these reactions in decreasing order of reactivity. Give suitable explanation.

Zn + CuSO 4 ———> ZnSO 4 + Cu
Cu + 2AgNO 3 ———> Cu(NO 3 ) 2 + 2Ag
Zn + FeSO 4 ———-> ZnSO 4 + Fe
Fe + CuSO 4 ———-> FeSO 4 + Cu

(b) What is the nature of the reactions ? Answer: (a)

Since Zn displaces Cu from CuSO 4 solution, it is more reactive than Cu.
Since Cu displaces Ag from AgNO 3 solution, it is more reactive than Ag.
Since Zn displaces Fe from FeSO 4 solution, it is more reactive than Fe.
Since Fe displaces Cu from CuSO 4 solution, it is more reactive than Cu. The decreasing order of reactivity of the metals is : Zn > Fe> Cu> Ag

(b) All these reactions are the examples of displacement reactions.

Question 5. A, B and C are three elements which undergo chemical reactions according to following equations. A 2 O 3 + 2B ———-> B 2 O 3 + 2A 3CSO 4 + 2B ———-> B 2 (SO 4 ) 3 + 3C 3CO + 2A ———> A 2 O 3 + 3C Answer the following questions : (a) Which element is the most reactive ? (b) Which element is the least reactive ? Answer: (a) The most reactive element is ‘B’ as it has displaced both A’ and ‘C’ from their compounds. (b) The least reactive element is ‘C’ as it has been replaced by both A’ and ‘B’.

Question 6. You are given the following materials

Marble chips
Dilute hydrochloric acid
Zinc granules

Identify the type of reaction when marble chips and zinc granules are added separately to acid taken in two tubes. Write chemical equations in each case. Answer:

Marble chips react with dilute hydrochloric acid to form calcium chloride and carbonic acid. The acid changes to CO 2 and H 2 O. It is a double displacement reaction. CaCO 3 (s) + 2HCl (aq) ———–> CaCl 2 (aq) + H 2 CO 3 (aq) (CO 2 +H 2 O)
Zinc granules react with hydrochloric acid to form zinc chloride accompanied by hydrogen gas. It is a displacement reaction. Zn(r) + 2HCl(aq) ———–> ZnCl 2 (aq) + H 2 (g)

Question 7. A strip of a metal X is immersed in the aqueous solution of salt YSO 4 blue in colour. After sometime, a layer the metal Y from the salt solution is deposited on the strip of the metal X. Whereas the metal X is used for galvanisation, the metal Y is employed in making electric cables.

Predict the metal X.
What could be the metal Y ?
Can yon name the salt YSO 4 ?
What is the nature of the chemical reaction taking place ?
Since the metal X is used for galvanisation, it is most probably Zn.
Since the metal Y is used in electric cable, it is likely to be Cu.
The salt is CuSO 4 .

Hope given HOTS Questions for Class 10 Science Chapter 1 Chemical Reactions and Equations are helpful to complete your science homework.

If you have any doubts, please comment below. Learn Insta try to provide online science tutoring for you.

CBSE Class 10
Class 10 Science MCQs
CBSE Class 10 Science MCQ Chapter 1 Chemical Reactions And Equations

CBSE Class 10 Science MCQs Chapter 1 Chemical Reactions and Equations

Chemical reactions and equations class 10 mcqs.

CBSE Class 10 Science Chemical Reactions and Equations MCQs are provided here to help students get acquainted with the new types of questions and their difficulty levels. Class 10 Science Chapter 1 MCQs have become an important part of the board exam. With the change in the exam pattern, the Board introduced MCQs in the Class 10 Science paper. So, to help students understand the different types of multiple-choice questions, we have compiled the CBSE Class 10 Science MCQs Chapter 1 Chemical Reactions and Equations. It will help them understand how MCQs are asked in the exam. So, accordingly, CBSE Class 10 students can practise the MCQs for Science Chapter 1. They can also find the answers to Class 10 Chemistry Chapter 1 MCQs on this page.

Students can download these Chemical Reaction and Equation Class 10 MCQs in PDF format from the link below and refer to them anytime during their studies. We have also compiled the CBSE Class 10 Science MCQs for all chapters in one place to help students prepare better for the board exams. Practising Class 10 Science Chapter 1 MCQs will boost students’ confidence levels.

Download CBSE Class 10 Science MCQs Chapter 1 Chemical Reactions and Equations PDF with Answers

It is expected that a few of the given Chemical Reactions and Equations Class 10 MCQs might be asked in the board exam. So, students are advised to practise Class 10 Science Chapter 1 MCQs thoroughly. We have also provided the answers to CBSE Class 10 Science MCQs Chapter 1, Chemical Reactions and Equations, so that students can easily check the answers and evaluate their preparation level. These Chemical Reactions and Equations MCQs will give students an idea of new types of questions that can be framed in the exam from this chapter. To practise more questions on Class 10 Chemistry Chapter 1 MCQs, students can also solve the CBSE Class 10 Science Sample Papers based on the latest syllabus and exam pattern. We have given below 20 MCQs for Class 10 Science Chemistry Chapter 1, along with answers.

CBSE Class 10 Science MCQs Chapter 1 Chemical Reactions and Equations with Answers

Q1) Sodium and chlorine are reacted, and as a result, sodium chloride is formed, which is also called table salt. What option gives the reactants and products of the reaction?

(a) Reactants – sodium; products – chlorine

(b) Reactants – sodium and table salt; products – chlorine

(d) Reactants – sodium and chlorine; products – sodium chloride

Correct Answer: Option (d)

Q2) Which of the following reaction can also be termed a thermal decomposition reaction?

(a) Combination reaction

(b) Decomposition reaction

(d) Double displacement reaction

Correct Answer: Option (b)

Q3) The image shows some chemical reactions.

CBSE Class 10 Science MCQ Chapter 1 Chemical Reactions and Equations-1

Which option identifies the reactants and products of the reactions?

CBSE Class 10 Science MCQ Chapter 1 Chemical Reactions and Equations-2

Correct Answer: Option (c)

Q4) A student performs an experiment to form aluminium chloride from aluminium and chlorine. Which of the following option gives the chemical equation of the reaction?

(a) Al + Cl 2 → AlCl 2

(b) 2Al + Cl 2 → 2AlCl

(d) 3Al + 3Cl 2 → 3AlCl 3

Q5. Give the ratio in which hydrogen and oxygen are present in water by volume.

Q6) A researcher adds barium hydroxide to hydrochloric acid to form a white-coloured barium chloride. Which of the following option gives the balanced chemical equation of the reaction?

(a) HCl + Ba(OH) 2 → BaCl 2 + 2HOH

(b) 2HCl + Ba(OH) 2 → BaCl 2 + 2HOH

(d) HCl + 2Ba(OH) → 2BaCl 2 + 2HOH + O 2

Q7. One of the following processes does not involve a chemical reaction, that is:

(a) Melting of candle wax when heated

(b) Burning of candle wax when heated

(d) Ripening of banana

Correct Answer: Option (a)

Q8) A student wrote a chemical equation of the reaction between carbon monoxide and hydrogen as,

CO2 + 2H 2 → CH 3 OH.

How can the reaction be classified?

(a) The reaction is an example of a combination reaction as a compound separates into two compounds.

(b) The reaction is an example of a decomposition reaction as a compound dissociates into two compounds.

(d) The reaction is an example of a decomposition reaction as two compounds react to form a single compound.

Q9) The chemical formula of magnesium oxide is ______.

(d) Mg(OH) 2

Q10) A student learns that some products are formed as a result of combining two compounds while some compounds are formed as a result of the dissociation of two compounds. The image shows two reactions.

CBSE Class 10 Science MCQ Chapter 1 Chemical Reactions and Equations-3

Which reaction is an example of a combination reaction and a decomposition reaction?

(a) Both reactions are examples of combination reaction

(b) Both reactions are examples of a decomposition reaction

(d) Reaction P is an example of a decomposition reaction, while reaction Q is an example of a combination reaction

Q11) From the following, which one is an example of a chemical reaction?

(a) Grapes get fermented

(b) Breakdown of food

(d) All of the above

Q12) A student adds lead and silver to two different test tubes containing an equal amount of copper sulphate solution. The student observes that the colour of the solution in the test tube with lead changes. What explains the change in the colour of the solution?

(a) A displacement reaction takes place as lead replaces copper from the solution.

(b) A combination reaction takes place as lead combines with sulphate in the solution.

(d) A double displacement reaction takes place as copper dissociates from sulphate and lead combines with sulphate in the solution.

Q13) Which of the following reactions is used in black-and-white photography?

(a) Combination Reaction

(b) Decomposition Reaction

(d) Oxidation reaction

Q14) What happens when lead nitrate reacts with potassium iodide?

(a) They will not react

(b) A large amount of hydrogen will be released

(d) Evolution of gas will occur

Q15) The chemical reaction between potassium chloride and silver nitrate is given by the chemical equation,

AgNO 3 + KCl → AgCl + KNO 3.

What can be inferred from the chemical equation?

(a) Silver nitrate and potassium undergo a decomposition reaction to form silver chloride and potassium nitrate

(b) Silver nitrate and potassium undergo a displacement reaction to form silver chloride and potassium nitrate

(d) Silver nitrate and potassium undergo a double displacement reaction to form silver chloride and potassium nitrate

Q16) Which of the following shows an oxidation reaction?

(a) Gain of oxygen

(b) Loss of oxygen

(d) None of the above

Answer: Option (a)

Q17) The image shows a reaction between zinc and hydrogen.

Which option shows oxidation?

(a) Zn → Zn +2

(b) 2H + → H 2

(d) H 2 → 2H +

Frequently Asked Questions on Chemical Reactions and Equations

What is a chemical reaction for class 10.

Chemical reactions are chemical changes in which reactants transform into products by making or breaking bonds (or both) between different atoms.

What is a chemical reaction and equation with an example?

Representation of a chemical reaction in terms of symbols and chemical formulae of the reactants and products is known as a chemical equation. Example: Fe (s) + S (s) → FeS (s)

What are 10 examples of a chemical reaction?

Below are the 10 examples of chemical reactions:

Rusting of iron
Burning of candle
Burning of wood
Formation of curd from milk
Waste decomposition
Cooking food
Formation of caramel from sugar by heating
Baking of cookies and cakes.
Photosynthesis process
Digestion of food

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Chemical Reactions and Equations Class 10 MCQ Test (Online Available)

Free mcq test, table of content, chemical reactions and equations test - 36.

Duration: 10 Mins

Maximum Marks: 10

Read the following instructions carefully.

1. The test contains 10 total questions.

2. Each question has 4 options out of which only one is correct .

3. You have to finish the test in 10 minutes.

4. You will be awarded 1 mark for each correct answer.

5. You can view your Score & Rank after submitting the test.

6. Check detailed Solution with explanation after submitting the test.

7. Rank is calculated on the basis of Marks Scored & Time

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1. The test contains 8 total questions.

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4. There is No Negative marking .

5. You will be awarded 1 mark for each correct answer.

6. You can view your Score & Rank after submitting the test.

7. Check detailed Solution with explanation after submitting the test.

8. Rank is calculated on the basis of Marks Scored & Time.

Chemical Reactions and Equations Test - 20

Duration: 25 Mins

Maximum Marks: 25

1. The test contains 25 total questions.

2. Each question has 4 options out of which only one is correct .

3. You have to finish the test in 25 minutes.

4. Try not to guess the answer as there is negative marking .

5. You will be awarded 1 mark for each correct answer and 0.25 will be deducted for each wrong answer.

6. There is no negative marking for the questions that you have not attempted.

7. You can view your Score & Rank after submitting the test.

8. Check detailed Solution with explanation after submitting the test.

9. Rank is calculated on the basis of Marks Scored & Time.

Chemical Reactions and Equations Test - 19

Duration: 20 Mins

Maximum Marks: 15

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Chemical Reactions and Equations Test - 18

Duration: 10 Mins

1. The test contains 10 total questions.

3. You have to finish the test in 10 minutes.

4. There is No Negative marking .

5. You will be awarded 1 mark for each correct answer.

6. You can view your Score & Rank after submitting the test.

7. Check detailed Solution with explanation after submitting the test.

8. Rank is calculated on the basis of Marks Scored & Time.

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The Chemical Reactions and Equations Class 10 MCQ are designed by our subject matter experts in a creative manner with proper research. Students can also increase their problem solving skills by going through the MCQs of Class 10 Chemical Reactions and Equations. Students can also improve their memorisation skills and concentration skills while attempting questions of Chemical Reactions and Equations.

It is very important to complete the chapter, then only they can perform well in the Chemical Reactions and Equations Class 10 MCQ. Regular solving of multiple choice questions can help students to build a strong foundation for the chapter Chemical Reactions and Equations and can get to know about the exam structure.

Chemical Reactions and Equations Class 10 MCQ Online Test

Chemical Reactions and Equations Class 10 MCQ online test are the form of objective type of questions in which students need to select the accurate answer. Students can attempt these questions in the online mode from the Selfstudys website, so that they can have a strong foundation for the chapter Chemical Reactions and Equations.

Where can Students Find the Chemical Reactions and Equations Class 10 MCQ?

Students can find the Chemical Reactions and Equations Class 10 MCQ from the Selfstudys website, steps to download are discussed below:

Open the Selfstudys website.

Chemical Reactions and Equations Class 10 MCQ, Chemical Reactions and Equations Class 10 MCQ Test, Chemical Reactions and Equations Class 10 Online MCQ, Class 10 Chemical Reactions and Equations MCQ Test, Chemical Reactions and Equations Class 10 MCQ Online Test

A drop down menu will appear, click MCQ from the list.

A new page will appear, select Class 10th from the list of classes.
Select Science from the list of subjects, again a drop down menu will appear in which list of chapters appear.
From the list of chapters, students need to select the chapter Chemical Reactions and Equations.
Again a new page will appear, now a student can easily practise questions online.

Features of the Chemical Reactions and Equations Class 10 MCQ

Multiple Choice Questions are those which a student needs to select an accurate option from the given options, this is one of the important feature of Chemical Reactions and Equations Class 10 MCQ, other features are:

All Types of Questions are Covered: In the MCQ of Chemical Reactions and Equations, students are provided with different types of questions: easy, moderate, difficult.
Analysis is Given: Analysis simply means to look into the mistakes done; question analysis is also given for Chemical Reactions and Equations MCQ so that students can improve.
Detailed Solutions are Given: Solutions are simply the reply to given questions, in the Chemical Reactions and Equations Class 10 MCQ with answers are given so that students don’t get stuck in the preparation.
Ranks and Scores are Given: Rank and score are provided in the Chemical Reactions and Equations MCQ so that students can get an idea about their performance.
Retry Option is Given: It is simply an option of attempting the same set of questions once again; retry option is given in the Class 10 Chemical Reactions and Equations MCQ so that students can attempt the questions without any hesitation in the exam.
All Topics are Covered: In the MCQ on Chemical Reactions and Equations Class 10, all topics are covered, through this students can also understand complex topics of the chapter.
For CBSE Board: The Class 10 Science MCQ of Chemical Reactions and Equations are created for those students who study in the CBSE board as the topics are according to their syllabus.

Why Are Chemical Reactions and Equations Class 10 MCQ Important?

It is very important to practise Chemical Reactions and Equations Class 10 MCQ as it provides crisp accuracy,it is one of benefit of solving questions, other benefits are:

Provides Confidence: As we all know that confidence can be only gained with proper practise of questions from MCQ of Chemical Reactions and Equations.
Helps to Manage Time: Routine practice of questions from Chemical Reactions and Equations MCQ can help students to manage their time while giving exams.
Provides Feedback: By practising questions from Class 10 Chemical Reactions and Equations MCQ can help students to provide instant feedback of their performance, so that they can improve accordingly.
Improves Efficiency: Efficiency is considered to be the ability of achieving the desired goal in less time; students can improve their efficiency with the help of MCQ questions on Chemical Reactions and Equations Class 10.
Helps to Understand the Concepts Better: The MCQ on Chemical Reactions and Equations Class 10 helps students to understand the concepts, accordingly they can score well.
Easy to Score: As the MCQ questions on Chemical Reactions and Equations Class 10 are easy for students to score as they just need to select the accurate option.
Saves Energy: The MCQs on Chemical Reactions and Equations simply saves energy as in other questions, students need to write long sentences to score good.

When Should Chemical Reactions and Equations Class 10 MCQ Be Solved?

It is very important for students to know when they solve the Chemical Reactions and Equations Class 10 MCQ, accordingly the goal can be fixed:

After Completing the Chapter: It is very important for students to practise MCQ of Chemical Reactions and Equations after completing the chapter so that they can improve their productivity.
To Revise: Students can take the help of Chemical Reactions and Equations MCQ to revise all the topics and concepts as revision is more important than completing the chapter.
To Monitor the Progress: If students don’t get an idea about where they are improving or progressing, then they can take the help of MCQ Chemical Reactions and Equations, so that they can easily monitor their progress.
To Know the Skills and Flaws: Students need to know the skills and flaws while preparing for the chapter, they can easily get to know by practising the Class 10 Chemical Reactions and Equations MCQ on a routine basis.
To Solve Confusions: There can be confusions regarding the chapter, students can solve those by solving the MCQ questions on Chemical Reactions and Equations Class 10 on a regular basis, accordingly they can improve their hold on the chapter.

How to Prepare Well for the Chemical Reactions and Equations Class 10 MCQ?

Students need to prepare well for Chemical Reactions and Equations Class 10 MCQ, so that they can get a good score as well as rank, tips to prepare well are:

Complete the Chapter: Students are advised to complete the given chapter so that they know each and every concept to perform well in Class 10 Chemical Reactions and Equations MCQ.
Try to Memorise Key Information: Students need to remember the key information so they can prepare well for MCQ of Chemical Reactions and Equations.
Try to Form Good Study Habits: A good study habit includes taking short breaks, breaks from distractions, etc, accordingly students can prepare well for the MCQ on Chemical Reactions and Equations Class 10.
Quiz Yourself: Students need to ask themselves questions related to the chapter, so that they can perform well in the MCQ questions on Chemical Reactions and Equations Class 10.

Tips to Select the Right Answer While Attempting Chemical Reactions and Equations Class 10 MCQ

Some of the tips to select the right answer while attempting Chemical Reactions and Equations Class 10 MCQ are discussed below:

Read the Question Carefully: Students need to read the whole question of Class 10 Chemical Reactions and Equations MCQ so that they can understand the question better.
Try to Attempt Easy Ones: Students are advised to attempt those questions of MCQ of Chemical Reactions and Equations which seem to be easier than other questions, this can decrease the level of anxiety.
Analyse the Wording of the Questions: Students need to analyse the wording of the questions like choose the most accurate option or choose the best option while attempting Class 10 Chemical Reactions and Equations MCQ.
Try to Review All the Possible Answers: Look at all the possible answers while attempting MCQ on Chemical Reactions and Equations Class 10, it is possible that two options can seem to be accurate.
Elimination Method: It is a wonderful method to find out the accurate answer while attempting MCQ on Chemical Reactions and Equations Class 10.

The Impact of MCQ on Chemical Reactions and Equations Class 10 in the Preparation

The MCQ on Chemical Reactions and Equations Class 10 plays a very important role in the preparation, here are some positive impact that a student needs to know:

Better Understanding of the Chapter: To mark an accurate answer while attempting MCQ of Chemical Reactions and Equations, students need to have a clear understanding of the topics and definitions, accordingly students can have a better understanding.
Better Preparation for the Exam: By practising questions from the Chemical Reactions and Equations MCQ, students can get familiar with the format, accordingly students can prepare well for the exam.
Improves Logical Thinking Skills: Often students need to analyse the options in Class 10 Chemical Reactions and Equations MCQ to give accurate answers so it is must for students to have good logical thinking skills.
Helps in Motivation: Regular solving of MCQ on Chemical Reactions and Equations Class 10 can help students to motivate themselves so that they can score well in exams.

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MCQ Questions for Class 10 Science Chemical Reactions and Equations with Answers

October 21, 2019 by Veerendra

Free PDF Download of CBSE Class 10 Science Chapter 1 Chemical Reactions and Equations Multiple Choice Questions with Answers. MCQ Questions for Class 10 Science with Answers was Prepared Based on Latest Exam Pattern. Students can solve NCERT Class 10 Science Chemical Reactions and Equations Multiple Choice Questions with Answers to know their preparation level.

Class 10 Science MCQs Chapter 1 Chemical Reactions and Equations

MCQ Questions for Class 10 Science Chemical Reactions and Equations with Answers 1

Answer: b Explaination: Reason: Here sodium (Na) displaces to form sodium hydroxide.

2. Magnesium ribbon is rubbed before burning because it has a coating of (a) basic magnesium carbonate (b) basic magnesium oxide (c) basic magnesium sulphide (d) basic magnesium chloride

3. Which of the following statements about the given reaction are correct? 3Fe (s) + 4H 2 O (g) → Fe 3 O 4 (s) + 4 H 2 (g) (i) Iron metal is getting oxidised (ii) Water is getting reduced (iii) Water is acting as reducing agent (iv) Water is acting as oxidising agent (a) (i), (zi) and (iii) (b) (in) and (iv) (c) (i), (ii) and (iv) (d) (ii) and (iv)

4. Which of the following are exothermic processes? (i) Reaction of water with quick lime (ii) Dilution of an acid (iii) Evaporation of water (iv) Sublimation of camphor (crystals) (a) (i) and (ii) (b) (ii) and (iii) (c) (i) and (iv) (d) (ii) and (iv)

Answer: a Explaination: Reason: In both the cases, heat energy is evolved.

5. Oxidation is a process which involves (a) addition of oxygen (b) addition of hydrogen (c) removal of oxygen (d) removal of hydrogen

6. The process of reduction involves (a) addition of oxygen (b) addition of hydrogen (c) removal of oxygen (d) removal of hydrogen

7. Three beakers labelled as A, B and C each containing 25 ml of water were taken. A small amount of NaOH, anhydrous CuSO 4 and NaCl were added to the beakers A, B and C respectively. It was observed that there was an increase in the temperature of the solution contained in beakers A and B, whereas in case of beaker C, the temperature of the solution falls. Which one of the following statement(s) is (are) correct? (i) In beakers A and B, exothermic process has occurred. (ii) In beakers A and B, endothermic process has occuBftd. (iii) In beaker C exothermic process has occurred. (iv) In beaker C endothermic process has occurred. (a) (i) only (b) (ii) only (c) (i) and (iv) (d) (iv), (ii) and (iii)

8. Give the ratio in which hydrogen and oxygen are present in water by volume. (a) 1:2 (b) 1:1 (c) 2:1 (d) 1:8

9. Which among the following statement(s) is (are) true? Exposure of silver chloride to sunlight for a long duration turns grey due to (i) the formation of silver by decomposition of silver chloride (ii) sublimation of silver chloride (iii decomposition of chlorine gas from silver chloride (iv) oxidation of silver chloride (a) (i) only (b) (i) and (iii) (c) (ii) and (iii) (d) (iv) only

10. MnO 2 + 4HCl → 2 + 2H 2 O + Cl 2 Identify the substance oxidized in the above . equation. (a) MnCl 2 (b) HCl (c) H 2 O (d) MnO 2

Answer: d Explaination: Reason: In this reaction HCl is oxidised to Cl 2 , whereas MnO 2 is reduced to MnCl 2 .

11. A substance ‘X’ is used in white-washing and is obtained by heating limestone in the absence of air. Identify ‘X’. (a) CaOCl 2 (b) Ca (OH) 2 (c) CaO (d) CaCO 3

MCQ Questions for Class 10 Science Chemical Reactions and Equations with Answers 2

12. When Ag is exposed to air it gets a black coating of (a) AgNO 3 (b) Ag 2 S (c) Ag 2 O (d) Ag 2 CO 3

13. Which of the following is an endothermic process? (a) Dilution of sulphuric acid (b) Sublimation of dry ice (c) Condensation of water vapours (d) Respiration in human beings

14. In the double displacement reaction between aqueous potassium iodide and aqueous lead nitrate, a yellow precipitate of lead iodide is formed. While performing the activity if lead nitrate is not available, which of the following can be used in place of lead nitrate? (a) Lead sulphate (insoluble) (&) Lead acetate (c) Ammonium nitrate (d) Potassium sulphate

15. What type of chemical reactions take place when electricity is passed through water? (a) Displacement (b) Combination (c) Decomposition (d) Double displacement

16. Select the oxidising agent for the following reaction: H 2 S + I 2 > 2HI + S (a) I 2 (b) H 2 S (C) HI (d) S

17. A substance added to food containing fats and oils is called: (a) Oxidant (b) Rancid (c) Coolant (d) Antioxidant

18. The condition produced by aerial oxidation of fats and oils in foods marked by unpleasant smell and taste is called: (a) antioxidation (b) reduction (c) rancidity (d) corrosion

19. Electrolysis of water is a decomposition reaction. The mole ratio of hydrogen and oxygen gases liberated during electrolysis of water is: (a) 1 : 1 (b) 2:1 (c) 4:1 (d) 1:2

20. When S02 gas is passed through saturated solution of H2S, which of the following reaction occurs? (a) SO 2 + 2H 2 S → 2H20 + 3S (b) SO 2 + 2H 2 S → H20 + 3S (c)SO 2 + H 2 S → H 2 O + S (d) SO 2 + H 2 O → SO 3 + H 2

21. Name the products formed when iron filings are heated with dilute hydrochloric acid (a) Fe (III) chloride and water (b) Fe (II) chloride and water (c) Fe (II) chloride and hydrogen gas (d) Fe (III) chloride and hydrogen gas

Answer: d Explaination: Reason: 2Fe + 6HCl → 2FeCl 3 (Iron (III) chloride) + 3H 2

22. Pb + CuCl 2 → PbCl 2 + Cu The above reaction is an example of: (a) combination (b) double displacement (c) decomposition (d) displacement

23. Which of the following gases can be used for storage (a) Carbon dioxide or Oxygen (b) Nitrogen or Oxygen (c) Carbon dioxide or Helium (d) Helium or Nitrogen

24. A dilute ferrous sulphate solution was gradu¬ally added to the beaker containing acidified permanganate solution. The light purple colour of the solution fades and finally disap¬pears. Which of the following is the correct explanation for the observation? (a) KMnO 4 is an oxidising agent, it oxidises FeSO 4 . (b) FeSO 4 acts as an oxidising agent and oxidises KMNO 4 . (c) The colour disappears due to dilution; no reaction is involved. (d) KMnO 4 is an unstable compound and de-composes in presence of FeSO 4 . to a colourless compound.

25. In which of the following chemical equations, the abbreviations represent the correct states of the reactants and products involved at reaction temperature? (a) 2H 2 (l) + O 2 (l) > 2H 2 O(g) (b) 2H 2 (g) + O 2 (l) > 2H 2 O (l) (c) 2H 2 (g) + O 2 (g) > 2H 2 O (l) (d) 2H 2 (g) +O 2 (g) > 2H 2 O (g)

Fill in the Blanks

1. The addition of oxygen to a substance is called …………. whereas removal of oxygen is called …………. . 2. The addition of hydrogen to a substance is called …………. whereas removal of hydrogen is called …………. . 3. Precipitation reactions produce insoluble …………. . 4. Reactions in which energy is given out are known as …………. . 5. Reaction in which an element displaces another element from its compound is called …………. . 6. Two antioxidants which are usually added to fat and oil containing foods to prevent rancidity, are …………., …………. . 7 …………. is the process in which metals are eaten up gradually by the action of air, moisture or a chemical on their surface. 8. 2 FeSO 4 → Fe 2 O 3 + SO 2 + …………. 9. Na 2 SO 4 + BaCl 2 → …………. + 2NaCl 10. Complete the missing components/variables given as x and y in the following reactions: (a) Pb (NO 3 ) 2 (aq) + 2KI (aq) → Pbl 2 (x) + 2KNO 3 (y) (b) Cu (s) + 2AgNO 3 (aq) → Cu (NO 3 ) 2 (aq) + x (s)

1. oxidation, reduction 2. reduction, oxidation 3. salts 4. exothermic reactions 5. displacement reaction 6. BHA and BHT 7. Corrosion 8. SO3 9. BaSO4 10. (a) x → (s); y → (aq); (b) x → 2Ag

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