Sugandha prepares HCl gas in her school laboratory using certain chemicals, She puts both dry and wet blue litmus paper in contact with the gas.
(i) Name the reagents used by Sugandha to prepare HCl gas.
(ii) State the colour changes observed with the dry and wet blue litmus paper.
Show the formation of ions when HCl gas combines with water.

Explanation

(i) Solid sodium chloride and conc. Sulphuric acid
(ii) Dry litmus- no change
Wet blue litmus- changes to red
(iii) `HCl+H_2O to H_3O^(+)+Cl^-`
(Hydronium ion) (Chloride ion)