Question Detail
Question
What gas is liberated when sodium sulphite (Na₂SO₃) reacts with an acid like HCl on heating?
Correct Answer
Option C is the correct answer.
Detailed Explanation
Page 23 states, 'On heating, sulphites such as sodium sulphite (Na₂SO₃) reacts with an acid such as HCl to liberate sulphur dioxide gas.' The reaction given is: Na₂SO₃(aq) + 2HCl(aq) → 2NaCl(aq) + SO₂(g) + H₂O(l).
Hint
The reaction equation provided clearly shows the gaseous product.