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 :

{H g}^{2 +}

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{B i}^{3 +}

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{P b}^{2 +}

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{C u}^{+}

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Solution

The correct option is A ${B i}^{3 +}$
The black ppt is due to formation of $B i I_{3}$ and orange ppt is due to formation of $K (B i I_{4})$ .
$B i (N O_{3})_{3} + 3 K I \to B i I_{3} ↓ (b l a c k) + 3 K N O_{3}$
$B i I_{3} + K I \to K_{4} (B i I_{4}) (o r a n g e)$

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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 :

The correct option is A Bi3+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)+3KNO3BiI3+KI→K4(BiI4)(orange)

The correct option is A ${B i}^{3 +}$
The black ppt is due to formation of $B i I_{3}$ and orange ppt is due to formation of $K (B i I_{4})$ .
$B i (N O_{3})_{3} + 3 K I \to B i I_{3} ↓ (b l a c k) + 3 K N O_{3}$
$B i I_{3} + K I \to K_{4} (B i I_{4}) (o r a n g e)$