Rohit has solution X, Y and Z that has pH 2, 7 and 13 respectively.
Which solution:
(a) will liberate sulphur dioxide gas when heated with sodium sulphite
(b) will liberate ammonia gas when reacted with ammonium chloride
(c) will not have any effect on litmus paper?
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(a) X
Reason — Sodium sulphite can react with acids to liberate sulphur dioxide gas. So, the solution X with pH 2 (acidic) will react with sodium sulphite to liberate sulphur dioxide gas.
Na2SO3 + 2H- ⟶ SO2 + H2O + 2Na+
(b) Z
Reason — Ammonium chloride is a salt that, in the presence of a base, will release ammonia gas. Therefore, a basic solution (with a high pH) will react with ammonium chloride to liberate ammonia gas. Thus, the solution Z with pH 13 (basic) will liberate ammonia gas when reacted with ammonium chloride.
NH4Cl + OH- ⟶ NH3 + H2O + Cl-
(c) Y
Reason — The solution Y with pH 7 will not have any effect on litmus paper as it is neither acidic nor basic.