A metal nitrate reacts with KI to give a black precipitate which on addition of exces of KI converts into orange colour solution. The cation of metal nitrate is :
A
Hg2+
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B
Bi3+
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C
Pb2+
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D
Cu+
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Solution
The correct option is ABi3+ The black ppt is due to formation of BiI3 and orange ppt is due to formation of K(BiI4). Bi(NO3)3+3KI→BiI3↓(black)+3KNO3 BiI3+KI→K4(BiI4)(orange)