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When excess of SnCl2 is added to a solut...

When excess of `SnCl_2` is added to a solution of `HgCl_2`, a white precipitate turning grey is obtained. The grey colour is due to the formation of

A

`Hg_(2)Cl_(2)`

B

`SnCl_(4)`

C

`Sn`

D

`Hg`

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