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

Chapter 1 Chemical Reactions and Equations MCQ Questions for Class 10 Science will be useful in improving your weak areas and never lose your marks. They are not only time-saving but also provide a structured format in which students must select from a set of options.

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

1. The colour of ferrous sulphate crystals is :

(a) Deep green

(b) Light green

(c) Bluish green

(d) None of the above

Solution

(b) Light green

2. Which of the following metal is protected by a layer of its oxide ?

(a) Copper

(b) Iron

(c) Aluminium

(d) Sodium

Solution

(c) Aluminium

3. The reaction of water and quick lime is an example of

(a) combination reaction

(b) exothermic reaction

(c) both (a) and (b)

(d) None of the above

Solution

(c) both (a) and (b)

4. The reaction between calcium oxide and water is :

(a) Combination reaction

(b) Decomposition reaction

(c) Displacement reaction

(d) Double-decomposition reaction

Solution

(a) Combination reaction

5. The chemical formula of lead nitrate is:

(a) KNO₃

(b) PbNO₃

(c) K(NO₃)₂

(d) Pb(NO₃)₂

Solution

(d) Pb(NO₃)₂

6. Reaction between calcium oxide and water is a ______ reaction.

(a) endothermic reaction

(b) decomposition reaction

(c) exothermic reaction

(d) displacement reaction

Solution

(c) exothermic reaction

7. The compound also known as blue vitriol is

(a) FeSO₄.7H₂O

(b) CuSO₄.5H₂O

(c) CaSO₄.2H₂O

(d) Na₂CO₃.10H₂O

Solution

(b) CuSO₄.5H₂O

8. The oxidation reaction which produces heat and light is called:

(a) Endothermic

(b) Photochemical

(c) Exothermic

(d) Combustion

Solution

(d) Combustion

9. What is the colour of CuSO₄.5H₂O?

(a) Blue

(b) Green

(c) White

(d) Yellow

Solution

(a) Blue

10. In which of the following, the identity of initial substance remains unchanged ?

(a) Curdling of milk

(b) Formation of crystals by process of crystallisation

(c) Fermentation of grapes

(d) Digestion of food

Solution

(b) Formation of crystals by process of crystallisation.

11. Strong heating of ferrous sulphate leads to the formation of a brown solid and two gases. This reaction can be categorised as

(a) displacement and redox

(b) decomposition and redox

(c) displacement and endothermic

(d) decomposition and exothermic

Solution

(b) decomposition and redox

12. When iron nail is kept in blue coloured copper sulphate solution, after a while the colour obtained in the test tube for the solution is

(a) Blue

(b) Brown

(c) Green

(d) Red

Solution

(c) Green

14. What is the chemical name for slaked lime ?

(a) Sodium hydroxide

(b) Calcium oxide

(c) Calcium hydroxide

(d) Sodium chloride

Solution

 

(c) Calcium hydroxide

15. The copper coin is dipped in blue coloured copper sulphate solution, the colour obtained after half an hour is

(a) Reddish

(b) Brownish

(c) Colourless

(d) blue colour

Solution

(d) blue colour

16. Which 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

(c) Number of atoms/molecules of the reactants and products formed

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

Solution

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

17. A student strongly heats hydrated ferrous sulphate salt in a dry test tube. He would observe a:

(a) yellow residue

(b) brown residue

(c) light green residue

(d) white residue

Solution

(b) brown residue

18. On adding zinc granules to freshly prepared ferrous sulphate solution a student observes that:

(a) a dull brown coating is formed

(b) a black coating is formed

(c) a greyish coating is formed

(d) no coating is formed

Solution

(c) a greyish coating is formed

19. Which of the following gases can be used for storage of fresh sample of an oil for a long time?

(a) Carbon dioxide or oxygen

(b) Nitrogen or helium

(c) Helium or oxygen

(d) Nitrogen or oxygen

Solution

(b) Nitrogen or helium

20. Lime water is

(a) CaO

(b) Ca(OH)₂

(c) CaCO₃

(d) CaCl₂

Solution

(b) Ca(OH)₂

21. We store silver chloride in a dark coloured bottle because it is

(a) a white solid

(b) undergoes redox reaction

(c) to avoid action by sunlight

(d) none of the above

 

Solution

(c) to avoid action by sunlight

22. Fatty foods become rancid due to the process of

(a) oxidation

(b) corrosion

(c) reduction

(d) hydrogenation

Solution

(a) oxidation

23. In the reaction of sodium sulphate and barium chloride the colour of the precipitate formed is

(a) Yellow

(b) Green

(c) White

(d) Black

Solution

(c) White

23. Which metal is displaced when lead is put in the solution of copper chloride ?

(a) Lead

(b) Copper

(c) Chlorine

(d) All of the above

Solution

(b) Copper

24. When zinc granules are dipped in blue coloured copper sulphate solution, the colour of solution obtained is

(a) blue

(b) yellow

(c) colourless

(d) brown

Solution

(c) colourless

25. The colour of the residue left in the test tube after heating ferrous sulphate which undergoes decomposition is

(a) yellowish-brown

(b) black

(c) white

(d) grey

Solution

(a) yellowish-brown

26. An iron nail was dipped in a salt solution. After sometime a reddish brown deposition of the nail was seen. The salt solution could be

(a) Silver nitrate

(b) Sodium sulphate

(c) Aluminium chloride

(d) Copper sulphate

Solution

(d) Copper sulphate

Chapter 1 Class 10 Science MCQs can efficiently test a large amount of content within a relatively short period of time. Students will learn how to grasp concepts easily and memorize the basics.