Question

Q. 1 g of solid sodium chloride is taken in a clean and dry test tube and 2mL of conc. sulphuric acid' 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 colour ? Give reason for your answer. What inference can be drawn about the nature of the evolved gas ? Support your answer with chemical equation for the reaction.​

Answer 1

Answer:

Concentrated suphuic acid reacts with sodium chloride to form hydrogen chloride gas. When the gas evolved is tested with dry blue litmus paper then there is no change in the colour of the dry blue litmus paper. This shows that HCl gas does not behave as an acid in the absence of water.J