1.

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

Answer»

`Hg^(2+) `
`Bi^(3+) `
`PB^(2+)`
`Cu^(+)`

SOLUTION :`Bi(NO_3)_3 (AQ) + 3KI to BiI_3(s) + 3KNO_3 (aq)`
`BiI_3 + KI to underset("SOLUBLE")(K[BiI_4])`


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