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CGP EDU Academic Team
Published on: August 13, 2026
A metal nitrate reacts with KI to give a black precipitate which on addition of excess of KI is converted into orange colour solution. The cation of the metal nitrate is :
Text Solution
Verified by ExpertsThe correct answer is:
B
Hg 2+ gives red precipitate of HgI 2 which dissolves in excess KI forming colourless [HgI 4 ] 2– ions.
Bi 3+ + 3I – 
BiI 3 ↓ (black) ; BiI 3 + I – 
[BiI 4 ] – (orange solution)
Pb 2+ gives yellow precipitate of PbI 2 . Cu 2+ gives white precipitate of Cu 2 I 2 with evolution of iodine.
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