Acid, Base & Salt

MCQs: 2

Question: 11. What happens when a blue litmus paper dipped in the solution of base?

1. Litmus paper remains blue
2. Litmus paper turns red
3. Litmus paper turns green
4. Colour of litmus paper vanishes out

Answer: (a) Litmus paper remains blue

Explanation: Basic solution changes the red litmus paper blue. Thus, no change takes place when blue litmus paper is dipped into basic solution.

Question: 12. Acids dissociate which ions in their aqueous solution?

1. Hydroxide ions
2. Hydrogen ions
3. Carbonate ions
4. None of the above

Answer: (b) Hydrogen ions

Question: 13. Bases dissociate which ions in their aqueous solution?

1. Hydroxide ions
2. Hydrogen ions
3. Chloride ions
4. None of the above

Answer: (a) Hydroxide ions

Question: 14. What happens when zinc reacts with hydrochloric acid?

1. Gives hydrogen gas
2. Gives oxygen gas
3. Gives carbon dioxide gas
4. Gives hydrogen sulphide gas

Answer: (a) Gives hydrogen gas

Question: 15. What happens when zinc reacts with sodium hydroxide?

1. Gives hydrogen gas
2. Gives oxygen gas
3. Gives carbon dioxide gas
4. Gives hydrogen sulphide gas

Answer: (a) Gives hydrogen gas

Question: 16. Which of the following is not an organic acid?

1. Citric acid
2. Lactic acid
3. Hydrochloric acid
4. Tartaric acid

Answer: (c) Hydrochloric acid

Question: 17. Which of the following is not a synthetic acid?

1. Citric acid
2. Sulphuric acid
3. Nitric acid
4. Hydrochloric acid

Answer: Citric acid

Question: 18. Which of the acid is found in milk?

1. Citric acid
2. Lactic acid
3. Tartaric acid
4. Sulphuric acid

Answer: (b) Lactic acid

Question: 19. Which acid is found in tamarind?

1. Citric acid
2. Lactic acid
3. Tartaric acid
4. Sulphuric acid

Answer: (c) Tartaric acid

Question: 20. Which acid is found in curd?

1. Citric acid
2. Lactic acid
3. Tartaric acid
4. Sulphuric acid

Answer: (b) Lactic acid