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HgCl2 and SmCl2 cannot exist together in...

HgCl_2` and `SmCl_2` cannot exist together in an aqeous solution . Explain.

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`Sn Cl_2` is a strong reducing agent and hence reduces `HeCl_2` first to `HgCl_2` ( white ) and then to `Hg` ( black ). Hence , these do not exist together .
`SnCl_2 2 hgCl_2 rarr SnCl_4 + Hg_2Cl_2`
`SnCl_2 + Hg_2Cl_2 rarr SnCl_4 +Hg`.
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