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A metal nitrate reacts with KI to give a...

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

`Hg^(2+)`

B

` Bi^(3+)`

C

`Pb^(2+)`

D

`Cu^(+)`

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The correct Answer is:
B
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