Ammonium salts on heating with slaked lime liberates a colo…

Chemistry Chemical Analysis Mix Single Correct MCQ

Published on: August 14, 2026

Ammonium salts on heating with slaked lime liberates a colourless gas (X). Identify the incorrect statement for gas (X).

(X) turns red litmus blue and produces dense white fumes in contact with dilute HCl.

(X) turns filter paper moistened with mercurous nitrate black.

(X) when passed through Nessler's reagent produces a black colour precipitate.

(X) gives intense blue coloured solution with aqueous solution of CuSO 4 .

Text Solution

Verified by Experts

The correct answer is:

NH 4+ + OH – NH 3 + H 2 O.

NH 3 , alkaline in nature turns red litmus blue;

NH 3 + HCl — → NH 4 Cl (white fumes)

2Hg NO 3 + 2NH 3 — → + NH 4 NO 3

2K 2 (Hg Ι 4 ) + NH 3 + 3KOH — → HgOHgNH 2 Ι ↓ (brown) + 7K Ι + 2H 2 O

CuSO 4 + 4NH 3 — → [Cu(NH 3 ) 4 ] SO 4 (intense blue)

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