JEE Main · 2025 · 07 Apr 2025 · Shift 1 · Compounds Containing Nitrogen

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When a salt is treated with sodium hydroxide solution it gives gas X . On passing gas X through reagent Y a brown coloured precipitate is formed. X and Y respectively, are

(A) $X = NH_{3}$ and $Y = HgO$
(B) $X = NH_{3}$ and $Y = K_{2} HgI_{4} + KOH$ ✓ Correct
(C) $X = NH_{4} Cl$ and $Y = KOH$
(D) $X = HCl$ and $Y = NH_{4} Cl$

Answer: (B)

Solution

Treating an ammonium salt with sodium hydroxide liberates ammonia gas. Passing ammonia into Nessler's reagent, the alkaline solution of

K_{2} [H g I_{4}]

, gives the brown iodide of Millon's base as a precipitate. The gas is ammonia and the reagent is

K_{2} H g I_{4}

with KOH.

JEE Main · 2025 · 07 Apr 2025 · Shift 1 · Single correct option

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