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Valence Bond Theory

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A solution of a metal ion when treated with $K I$ gives a red precipitate which dissolves in excess $K I$ to give a colorless solution. Moreover, the solution of metal ion on treatment with a solution of cobalt (II) thiocyanate gives rise to a deep-blue crystalline precipitate. The metal ion is :

A

P b^{2 +}

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B

H g^{2 +}

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C

C u^{2 +}

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D

C O^{2}

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Solution

The correct option is B $H g^{2 +}$
Option (B) is correct.
The metal ion is $H g^{2 +}$ .
$H g^{2 +} + 2 I^{-} ⟶ H g I_{2} ↓$ (Scarlet red precipitate)

$H g I_{2} + 2 I^{-} ⟶ [H g I_{4}]^{2 -}$

$\begin{matrix} H g^{2 +} & + & C o (S C N)_{2} & ⟶ & H g (S C N)_{2} ↓ & + & C o^{2 +} D e e p b l u e c r y s t a l l i n e \end{matrix}$

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Q. A solution of metal ion when treated with KI gives a red precipitate which dissolves in excess KI to give a colourless solution. Moreover, the solution of metal ion on treatment with a solution of cobalt(II) thiocyanate gives rise to a deep blue crystalline precipitate. The metal ion is :

Q. A solution of metallic ion when treated with

K I

gives a red precipitate which dissolves in excess of

K I

to give a colourless solution. Moreover, the solution of metal ion on treatment with solution of cobalt(II) thiocyanate gives rise to a deep blue crystalline precipitate. The metal ion is:

Q. A solution of a metal ion, when treated with KI, gives a red precipitate which dissolves in an excess of KI to give a colourless solution. Moreover, the solution of the metal ion on treatment with a solution of cobalt (II) thiocyanate gives rise to a deep blue crystalline precipitate. The metal ions is:

Q. A solution of

H g^{2 +}

ion on treatment with a solution of cobalt(II) thiocyanate gives rise to a deep blue crystalline precipitate, then the coordination number of mercury in the deep blue colored compound is :

An aqueous blue coloured solution of a transition metal nitrate reacts with

H_{2} S

in acidic medium to give a black precipitate (X), which dissolves in

K C N

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K I

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The electron configuration of the transition metal ion is

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