TOP 20 Multiple Choice Questions on Acid Base Salt.

1. Which one of the following is acidic?

(a) Lemon juice (b) Tomatoes (c) Milk (d) All of these

2. Which one of the following will turn red litmus blue?

a) Vinegar b) Baking soda solution c) Lemon juice d) Soft drinks

3. Which one of the following will turn blue litmus red?

a) Vinegar b) Lime water c) Baking soda solution d) Washing soda solution

4. Lime water is…

a) CaO b) Ca(OH)₂ c) CaCO₃ d) CaCl₂

5. The nature of calcium phosphate is present in tooth enamel is

a) Basic b) Amphoteric c) Acidic d) Neutral

6. Which of the following does not form an acidic salt?

(a) Phosphoric acid b) Carbonic acid c) Hydrochloric acid d) Sulphuric acid

7. The chemical formula of caustic potash is

(a) NaOH b) Ca(OH)₂ c) NH₄OH d) KOH

8. 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) 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)

9. 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

10. 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

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

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

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

14. Sodium carbonate is a basic salt because it is a 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

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

16. 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

17. 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

18. Fatty foods become rancid due to the process of

a) oxidation

b) corrosion

c) reduction

d) hydrogenation

19. Rancidity can be prevented by

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

20. When Ag is exposed to air it gets a black coating of
a) AgNO₃
b) Ag₂S
c) Ag₂O
d) Ag₂CO₃