Chemical Reactions and Equations MCQs | Class 10 Science Chapter 1 Quiz

Are you preparing for CBSE Class 10 Science Chapter 1 – Chemical Reactions and Equations? Test your knowledge with these MCQs based on the latest NCERT syllabus. This quiz will help you revise important concepts like types of chemical reactions, balancing equations, and oxidation-reduction reactions. Attempt the quiz now and check your score instantly!

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Class 10 Science Chapter 1 Chemical Reactions and Equations MCQs

Chapter 1: Chemical Reactions and Equations

1 / 15

Assertion (A): In the reaction: MnO₂ + 4HCl → MnCl₂ + 2H₂O + Cl₂

HCl is getting oxidized while MnO₂ is getting reduced.

Reason (R): The process in which oxygen is added to a substance is called oxidation whereas the process in which oxygen is removed from a substance is called reduction.

a. Both (A) and (R) are true and (R) is the correct explanation of the assertion.

b. Both (A) and (R) are true, but (R) is not the correct explanation of the assertion.

c. (A) is true, but (R) is false

d. (A) is false, but (R) is true.

2 / 15

Assertion (A): Following is a balanced chemical equation for the action of steam on iron:

3Fe + 4H₂0 → Fe₃O₄ + 4H₂

Reason (R): The law of conservation of mass holds good for a chemical equation.

a. Both (A) and (R) are true and (R) is the correct explanation of the assertion.

b. Both (A) and (R) are true, but (R) is not the correct explanation of the assertion.

c. (A) is true, but (R) is false

d. (A) is false, but (R) is true.

3 / 15

Sunita takes about 2 g ferrous sulphate crystals in a dry boiling tube and heats the boiling tube over the flame of a burner or spirit lamp as shown in the figure.

chemical reactions and equations questions and answers

The color of crystals after heating is:

a. Black

b. Brown

c. Green

d. Orange

4 / 15

A small amount of copper powder is heated as shown in the figure.

chemical reactions and equations class 10

Which reaction shows the above reaction?

a. 4Cu + O2 → 2Cu2O

b. CuO + H2 → Cu + H2O

c. 2Cu + O2 → 2CuO

d. None of the above

5 / 15

Which of the following statements about the given reaction are correct?

3Fe + 4H₂O → Fe₃O₄ + 4H₂

Iron metal is getting oxidized.

Water is getting reduced.

Water is acting as a reducing agent.

Water is acting as an oxidizing agent.

a. 1, 2, and 3

b. 3 and 4

c. 1, 2, and 4

d. 2 and 4

6 / 15

Assertion (A): A white-washed wall develops a coating of calcium carbonate after a few days.

Reason (R): Calcium oxide on the wall reacts slowly with carbon dioxide in the air.

a. Both (A) and (R) are true and (R) is the correct explanation of the assertion.

b. Both (A) and (R) are true, but (R) is not the correct explanation of the assertion.

c. (A) is true, but (R) is false

d. (A) is false, but (R) is true.

7 / 15

Identify the endothermic reaction(s) among the following:

6CO₂ + 12H₂O → C₆H₁₂O₆ + 6O₂ + 6H₂O

Na₂CO₃ + 2HCl → 2NaCl + CO₂ + H₂O

C₆H₁₂O₆ + 6O₂ → 6CO₂ + 6H₂O

CaCO₃ → CaO + CO₂

a. Only 1

b. Only 4

c. Only 2 and 3

d. Only 1 and 4

8 / 15

Solid calcium oxide reacts vigorously with water to form calcium hydroxide accompanied by the liberation of heat. This process is called slaking of lime. Which among the following is/are true about slaking of lime?

It is an endothermic reaction.

It is an exothermic reaction.

The pH of the resulting solution will be more than seven.

The pH of the resulting solution will be less than seven.

a. 1 and 2

b. 2 and 3

c. 1 and 4

d. 3 and 4

9 / 15

Which of the following are exothermic processes?

Reaction of water with quick lime
Dilution of an acid
Evaporation of water
Sublimation of camphor (crystals)

a. 1 and 2

b. 2 and 3

c. 1 and 4

d. 3 and 4

10 / 15

Which of the following reaction(s) is an endothermic reaction?

a. Burning of coal

b. Decomposition of vegetable matter into compost

c. Process of respiration

d. Decomposition of calcium carbonate to form quick lime and carbon dioxide.

11 / 15

Assertion (A): While equalizing the number of atoms to balance a chemical equation, we alter the formula of the compounds or elements involved in the reaction.

Reason (R): A chemical equation is balanced by making the number of atoms of each element equal on both sides of the arrow.

a. Both (A) and (R) are true and (R) is the correct explanation of the assertion.

b. Both (A) and (R) are true, but (R) is not the correct explanation of the assertion.

c. (A) is true, but (R) is false

d. (A) is false, but (R) is true.

12 / 15

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

a. 1:1

b. 2:1

c. 4:1

d. 1:2

13 / 15

The silver chloride is placed under the sunlight as shown in the figure. The color of silver chloride after some time is:

chemical reactions and equations questions and answer

a. Black

b. Green

c. Grey

d. Yellow

14 / 15

You are given the solution of lead nitrate. In order to obtain a yellow precipitate you should mix with it a solution of ______.

a. Potassium chloride

b. Potassium iodide

c. Potassium nitride

d. Potassium sulphide

15 / 15

Identify the product which represents the solid state in the above reaction.

chemical reactions and equations questions

a. Barium chloride

b. Barium sulphate

c. Sodium chloride

d. Sodium sulphate

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2	Kuljit	93 %	5 minutes 32 seconds	14
3	uttam	87 %	4 minutes 43 seconds	13
4	Raj	87 %	6 minutes 49 seconds	13
5	God Mode	80 %	3 minutes 6 seconds	12
6	Devansh	80 %	3 minutes 45 seconds	12
7	Aarnav garg	80 %	3 minutes 51 seconds	12
8	Ahana	80 %	4 minutes 32 seconds	12
9	shradhashree ray	80 %	16 minutes 42 seconds	12
10	Ram	67 %	4 minutes 38 seconds	10
11	Elisuba	67 %	5 minutes 22 seconds	10
12	Unknown	60 %	3 minutes 54 seconds	9
13	Madhabi Debnath	53 %	7 minutes 26 seconds	8
14	dharshan	47 %	4 minutes 30 seconds	7
15	uttam	47 %	4 minutes 59 seconds	7
16	Anand Pal	47 %	6 minutes 52 seconds	7
17	Anshika	47 %	8 minutes 39 seconds	7
18	alam	40 %	1 minutes 57 seconds	6
19	Aastha	33 %	43 seconds	5
20	Aastha	33 %	52 seconds	5
21	Nidhi Shrivastav	33 %	6 minutes 14 seconds	5
22	Shashi kant	27 %	7 minutes 21 seconds	4
23	Fdd	7 %	1 minutes 43 seconds	1

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Class 10 Science Chapter 1 Chemical Reactions and Equations MCQs

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