Chemistry - Salt Analysis Question with Solution | TestHub

The gas (Y) turns red litmus blue and forms white fumes with dilute HCl, which uniquely identifies it as ammonia (NH₃). The white fumes are due to the formation of ammonium chloride (NH₄Cl) via the reaction:

$$N{H}_3+HCl\to N{H}_{4}Cl$$

Nitrate salts like NaNO₃ (X) undergo reduction when treated with zinc in an alkaline medium (Zn/OH⁻) to evolve ammonia gas. Therefore, X is NaNO₃ and Y is NH₃, making (B) the correct choice.