When $\mathrm{MnO}_{2}$ and $\mathrm{H}_{2} \mathrm{SO}_{4}$ is added to a salt (A), the greenish yellow gas liberated as salt (A) is :

(D) $\mathrm{NH}_{4} \mathrm{Cl}$

JEE Main · 2024 · 04 Apr 2024 · Shift 2 · p-Block Elements

When

MnO_{2}

and

H_{2} SO_{4}

is added to a salt (A), the greenish yellow gas liberated as salt (A) is :

(A)NaBr
(B) $CaI_{2}$
(C) $KNO_{3}$
(D) $NH_{4} Cl$ ✓ Correct

Answer: (D)

Solution

M n O_{2}

oxidises chloride ion to chlorine gas in the presence of

H_{2} S O_{4}

2 N H_{4} C l + M n O_{2} + 2 H_{2} S O_{4} \to M n S O_{4} + (N H_{4})_{2} S O_{4} + 2 H_{2} O + C l_{2} ↑

The greenish-yellow gas is

C l_{2}

, released from the chloride salt, so salt A is

N H_{4} C l

JEE Main · 2024 · 04 Apr 2024 · Shift 2 · Single correct option

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