Which substance can absorb an acidic gas and form a salt?
Answer and explanation
Correct answer: Calcium hydroxide
Calcium hydroxide, Ca(OH)₂, is a base and can react with an acidic oxide such as carbon dioxide. For example, Ca(OH)₂ + CO₂ → CaCO₃ + H₂O; calcium carbonate is the salt formed, and the limewater may turn milky. Vinegar, hydrochloric acid, and lemon juice are acidic substances, so they do not normally neutralise an acidic gas to produce a salt in this context. Hence option A is correct.
Frequently asked questions
What is the correct answer to this question?
Calcium hydroxide
Why is this the correct answer?
Calcium hydroxide, Ca(OH)₂, is a base and can react with an acidic oxide such as carbon dioxide. For example, Ca(OH)₂ + CO₂ → CaCO₃ + H₂O; calcium carbonate is the salt formed, and the limewater may turn milky. Vinegar, hydrochloric acid, and lemon juice are acidic substances, so they do not normally neutralise an acidic gas to produce a salt in this context. Hence option A is correct.
Which subject and chapter does this question cover?
This is a Class 10 Science question. Chapter: Chemical Substances – Nature and Behaviour. Topic: Acids, Bases, and Salts.
