When mercury (II) chloride is treated with excess of stannous chloride, the products obtained are _______________ respectively.

liquid

H g

and

S n {C l}_{4}

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{H g}_{2} {C l}_{2}

and

S n {C l}_{4}

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{H g}_{2} {C l}_{2}

and

[S n {C l}_{4}]^{2 -}

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Liquid

H g

and

[S n {C l}_{4}]^{2 -}

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Solution

The correct option is A liquid $H g$ and $S n {C l}_{4}$
Mercuric chloride oxidises 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 an excess of stannous chloride.
$H g_{2} C l_{2} + S n C l_{2} \to 2 H g (l) + S n C l_{4}$

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