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When SnCl2 solution is added excess into a solution of HgCl2 , a white ppt is turning grey. Why?

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When SnCl2 solution is added excess into a solution of HgCl2 , a white ppt is turning grey. Why?  

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When SnCl2 solution is added to HgCl2 solution, initially white ppt, of Hg2Cl2 is formed which further reacts with SnCl2 forming metallic grey Hg

2HgCl2 + SnCl2 → SnCl4 + Hg2Cl2 (white)

Hg2Cl2 + SnCl2 → SnCl4 + 2Hg (grey)

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