Question

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

(a) Hg²⁺

(b) Bi³⁺

(c) Pb²⁺

(d) Cu⁺

 

Answer 1

The correct option (b) Bi³⁺

Explanation:

Bismuth nitrate, Bi(NO₃)₃, reacts with KI to give a black precipitate of BiI₃ which on addition of excess of KI, dissolved to give orange colour solution of KBiI₄ complex salt.