Acids Bases and Salts MCQ Type Questions for class 10

 Class 10 Science MCQs Chapter 2 Acids Bases and Salts

1. What happens when a solution of an acid is mixed with a solution of a base in a test tube?
(i) Temperature of the solution decreases
(ii) Temperature of the solution increases
(in) The temperature of the solution remains the same
(iv) Salt formation takes place
(a) (i) and (iv)
(b) (i) and (iii)
(c) (ii) only
(d) (ii) and (iv)

Answer

Answer: d

 

2. When hydrogen chloride gas is prepared on a humid day, the gas is usually passed through the guard tube containing calcium chloride. The role of calcium chloride taken in the guard tube is to
(a) absorb the evolved gas
(b) moisten the gas
(c) absorb moisture from the gas
(d) absorb Cl^– ions from the evolved gas

Answer/ Explanation

Answer: c
Explaination: Reason: Guard tube drys (absorbs water) from calcium chloride on a humid day.

 

3. Which one of the following salts does not contain water of crystallisation?
(a) Blue vitriol
(b) Baking soda
(c) Washing soda
(d) Gypsum

Answer

Answer: b

 

4. In terms of acidic strength, which one of the following is in the correct increasing order?
(a) Water < Acetic acid < Hydrochloric acid
(b) Water < Hydrochloric acid < Acetic acid
(c) Acetic acid < Water < Hydrochloric acid
(d) Hydrochloric acid < Water < Acetic acid

Answer

Answer: a

 

5. What is formed when zinc reacts with sodium hydroxide?
(a) Zinc hydroxide and sodium
(b) Sodium zincate and hydrogen gas
(c) Sodium zinc-oxide and hydrogen gas
(d) Sodium zincate and water

Answer/ Explanation

Answer: b
Explaination: Reason: Zn + 2NaOH → Ma₂Zn0₂ (Sodium Zincate) + H₂

 

6. Tomato is a natural source of which acid?
(a) Acetic acid
(b) Citric acid
(c) Tartaric acid
(d) Oxalic acid

Answer

Answer: d

 

7. Brine is an
(a) an aqueous solution of sodium hydroxide
(b) an aqueous solution of sodium carbonate
(c) an aqueous solution of sodium chloride
(d) an aqueous solution of sodium bicarbonate

Answer

Answer: c

 

8. Na₂CO₃ . 10H₂O is
(a) washing soda
(b) baking soda
(c) bleaching powder
(d) tartaric acid

Answer

Answer: a

 

9. At what temperature is gypsum heated to form Plaster of Paris?
(a) 90°C
(b) 100°C
(c) 110°C
(d) 120°C

Answer

Answer: b

 

10. How much water molecules do hydrated calcium sulphate contain?
(a) 5
(b) 10
(c) 7
(d) 2

Answer/ Explanation

Answer: d
Explanation: Reason: Chemical formula of hydrated calcium sulphate or gypsum is CaSO₄.2H₂O

 

11. Sodium carbonate is a basic salt because it is the salt of a
(a) strong acid and strong base
(b) weak acid and weak base
(c) strong acid and weak base
(d) weak acid and strong base

Answer

Answer: d

 

12. Alkalis are
(a) acids, which are soluble in water
(b) acids, which are insoluble in water
(c) bases, which are insoluble in water
(d) bases, which are soluble in water

Answer

Answer: d

 

13. Which of the following statements is correct about an aqueous solution of an acid and of a base?
(i) Higher the pH, stronger the acid
(ii) Higher the pH, weaker the acid
(in) Lower the pH, stronger the base
(iv) Lower the pH, weaker the base
(a) (i) and (iii)
(b) (ii) and (iii)
(c) (i) and (iv)
(d) (ii) and (iv)

Answer/ Explanation

Answer: d
Explanation: Reason: Stronger the acid, the lesser is the pH. Stronger the base, higher is the pH.

 

14. The apparatus given in the adjoining figure was set up to demonstrate electrical conductivity.

Which of the following statement(s) is (are) correct?
(i) Bulb will not glow because the electrolyte is not acidic.
(ii) Bulb will glow because HCl is a strong acid and furnishes ions for conduction.
(iii) Bulb will not glow because the circuit is incomplete.
(iv) Bulb will not glow because it depends upon the type of electrolytic solution.
(a) (i) and (iii)
(b) (ii) and (iv)
(c) (ii) only
(d) (iv) only

Answer

Answer: c

 

15. Lime water reacts with chlorine to give
(a) bleaching powder
(b) baking powder
(c) baking soda
(d) washing soda

Answer/ Explanation

Answer: c
Explanation:

16. Nettle sting is a natural source of which acid?

(a) MetiWanoic acid
(b) Lactic acid
(c) Citric acid
(d) Tartaric acid

Answer

Answer: a

 

17. Tooth enamel is made up of
(a) calcium phosphate
(b) calcium carbonate
(c) calcium oxide
(d) potassium

Answer

Answer: a

 

18. What is the pH range of our body?
(a) 7.0 – 7.8
(b) 7.2 – 8.0
(c) 7.0 – 8.4
(d) 7.2 – 8.4

Answer

Answer: a

 

19. Rain is called acid rain when its:
(a) pH falls below 7
(b) pH falls below 6
(c) pH falls below 5.6
(d) pH is above 7

Answer

Answer: c

 

20. Sodium hydroxide is a
(a) weak base
(b) weak acid
(c) strong base
(d) strong acid

Answer/ Explanation

Answer: c
Explanation: Reason: Sodium hydroxide ionises in water and produces a large amount of hydroxide ions.

 

21. An aqueous solution turns red litmus solution blue. Excess addition of which of the following solution would reverse the change?
(a) Baking powder
(b) Lime
(c) Ammonium hydroxide solution
(d) Hydrochloric acid

Answer

Answer: d

 

22. When copper oxide and dilute hydrochloric acid react, colour changes to
(a) white
(b) bluish-green
(c) blue-black
(d) black

Answer/ Explanation

Answer: b
Explanation: Reason: Blue-green colour of the solution is due to the formation of copper (II) chloride.

 

23. Sodium hydroxide is used
(a) as an antacid
(b) in the manufacture of soap
(c) as a cleansing agent
(d) in alkaline batteries

Answer

Answer: b

 

24. Sodium hydroxide turns phenolphthalein solution
(a) pink
(b) yellow
(c) colourless
(d) orange

Answer

Answer: a

 

25. Chemical formula of washing soda is
(a) Na₂C0₃ . 7H₂O
(b) Na₂C0₃ . 5H₂O
(c) Na₂C0₃ . 2H₂O
(d) Na₂C0₃ . 10H₂O

Answer

Answer: d

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