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Reaction with Metals

Mercuric chlo...

Question

Mercuric chloride is converted into mercury by:

placing copper metal in aqueous solution of

H g {C l}_{2}

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treating aqueous solution of

H g {C l}_{2}

with excess of stannous chloride

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treating aqueous solution of

H g {C l}_{2}

with

P b {C l}_{4}

solution

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none of these

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Solution

The correct options are
A treating aqueous solution of $H g {C l}_{2}$ with excess of stannous chloride
C placing copper metal in aqueous solution of $H g {C l}_{2}$
Mercuric chloride is converted into mercury by
(A) placing copper metal in aqueous solution of $H g C l_{2}$
$2 C u + H g C l_{2} \to 2 C u C l + H g$
(B) treating aqueous solution of $H g C l_{2}$ with excess of stannous chloride.
Mercuric chloride oxidses stannous chloride to stannic chloride . It itself is reduced to mercurous chloride.
$2 H g C l_{2} + S n C l_{2} \to H g_{2} C l_{2} + S n C l_{4}$
Mercurous chloride is reduced to metallic mercury (grey) when it reacts with excess of stannous chloride.
$H g_{2} C l_{2} + S n C l_{2} \to 2 H g ↓ S n C l_{4}$

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