Question

1 g of solid sodium chloride is taken in a clean and dry test tube and 2 ml of conc. H₂SO₄ is added to it. If the gas evolved is tested first with dry and then with wet blue litmus paper, in which case will the litmus paper change its colour? Give reasons for your answer. What inference can be drawn about the nature of the evolved gas? Support your answer with chemical equation for the reaction.