Published by:
CGP EDU Academic Team
Published on: August 13, 2026
An aqueous solution of a substance (X) gives a black precipitate on treatment with H 2 S gas in presence of NH 4 OH and NH 4 Cl which dissolves in aqua regia on heating. The ammonical solution of substance (X) gives red precipitate with dimethylglyoxime. The substance (X) is :
Text Solution
Verified by ExpertsThe correct answer is:
C
Ni 2+ + S 2– — → Ni 2 S ↓ (black) ¼dkyk½
NiS + HNO 3 + 3HCl — → Ni 2+ + S ↓ + NOCl + 2Cl – + 2H 2 O
Ni 2+ + 2 
[Ni(dmg) 2 ] ↓
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