We have Provided Class 10 MCQ Questions of Chemical Reactions and Equations to help students with understanding the concept very well. Students can tackle Class 10 Science Multiple Choice Questions with Answers to realize their preparation level.

Practice Class 10 Science MCQ Questions of Chemical Reactions and Equations

Check the underneath MCQ Questions of Chemical Reactions and Equations with Answer: -

1. The reaction between lead nitrate and potassium iodide present in aqueous solutions is an example of

(a) Decomposition Reaction
(b) Displacement Reaction
(c) Double Displacement Reaction
(d) Neutralisation Reaction

2. Fatty foods become rancid due to the process of

(a) oxidation
(b) corrosion
(c) reduction
(d) hydrogenation

3. Assertion: A lead nitrate on thermal decomposition gives lead oxide, brown coloured nitrogen dioxide and oxygen gas.

Reason: Lead nitrate reacts with potassium iodide to form yellow ppt of lead iodide and the reaction is double displacement as well as precipitation reaction.

(a) Both A and R are true and R is the correct explanation of A.
(b) Both A and R are true but R is not the correct explanation of A.
(c) A is true but R is false.
(d) A is false but R is true.
(e) Both A and R are false.

4. Silver article turns black when kept in the open for a few days due to formation of
(a) \(H_2S\)
(b) \(AgS\)
(c) \(AgSO_4\)
(d) \(Ag_2S\)

5. Reaction of ‘magnesium’ with air is

(A) Exothermic reaction
(B) Endothermic reaction
(C) Reversible reaction
(D) Substitution reaction

6. What type of chemical reactions take place when electricity is passed through water?

(a) Displacement
(b) Combination
(c) Decomposition
(d) Double displacement

7. In an electrolytic cell where electrolysis is carried, anode has:
(a) Positive change
(b) Negative charge
(c) Connected to negative terminal of the battery
(d) None of these is correct

8. On immersing an iron nail in \(CuSO_4\) solution for few minutes, you will observe

(a) no reaction takes place
(b) the colour of solution fades away
(c) the surface of iron nails acquire a black coating
(d) the colour of solution changes to green

9. Which of the given gases can be used for storage of fresh samples of an oil for a long time?

(A) Carbon dioxide or oxygen
(B) Nitrogen or helium
(C) Helium or oxygen
(D) Nitrogen or oxygen

10. Rancidity can be prevented by

(a) adding antioxidants
(b) storing food away from light
(c) keeping food in refrigerator
(d) all of these

11. In which of the following, heat energy will be evolved?

(a) Electrolysis of water
(b) Dissolution of \(NH_4Cl\) in water
(c) Burning of L.P.G.
(d) Decomposition of AgBr in the presence of sunlight

12. What is the other name for quick lime?

(A) Calcium hydroxide
(B) Calcium oxide
(C) Carbon dioxide
(D) Sodium oxide

13. Both \(CO_2\) and \(H_2\) gases are

(A) Heavier than air
(B) Colourless
(C) Acidic in nature
(D) Soluble in water

14. 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) (iii) and (iv)

15. The reaction of acetylene and hydrogen in presence of heated nickel powder is called:

(a) Substitution
(b) Dissociation
(c) Addition
(d) Decomposition.

16. Which of the following is not a physical change?

(a) Boiling of water to give water vapour
(b) Melting of ice to give water
(c) Dissolution of salt in water
(d) Combustion of Liquefied Petroleum Gas (LPG)

17. What happens when dilute Sulphuric acid is added to Zn granules?

(a) Hydrogen gas and Zinc chloride are produced.
(b) Chlorine gas and Zinc hydroxide are produced.
(c) No reaction takes place.
(d) Zinc salt and water are produced.

18. A teacher gave two test tubes to the students, one containing water and the other containing sodium hydroxide. She asked them to identify the test tube containing sodium hydroxide solution. Which one of the following can be used for the identification?

(a) Blue litmus
(b) Red litmus
(c) Sodium carbonate solution
(d) Dilute hydrochloric acid

19. The substitution is characteristic of:

(a) Alkenes
(b) Alkynes
(c) Carbon monoxide
(d) Paraffins.

20. What type of reaction is respiration

(a) Exothermic
(b) Endothermic
(c) Reduction reaction
(d) Combination reaction

Answer Key

1. (c) Double Displacement Reaction
2. (a) oxidation
3. (b) Both A and R are true but R is not the correct explanation of A.
4. (d) \(Ag_2S\)
5. (A) Exothermic reaction
6. (c) Decomposition
7. (a) Positive change
8. (d) the colour of solution changes to green
9. (B) Nitrogen or helium
10. (d) all of these
11. (c)  Burning of L.P.G.
12. (B) Calcium oxide
13. (B) Colourless
14. (a) (i) and (ii)
15. (c) Addition
16. (d) Combustion of Liquefied Petroleum Gas (LPG)
17. (a) Hydrogen gas and Zinc chloride are produced.
18. (b) Red litmus
19. (d) Paraffins.
20. (a) Exothermic

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