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A metal nitra...

Question

A metal nitrate reacts with KI to give a black precipitate which on addition of excess of KI convert into orange solution. The cation of the metal nitrate is

A

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B

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C

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D

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Solution

The correct option is B
$B i (N O_{3})_{3} (a q) + 3 K I (a q) \to B i I_{3} (s) + 3 K N O_{3} (a q)$ (Black)
$B i I_{3} (s) + K I (a q) \to K [B i I_{4}]$
Orange colour

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