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Standard XII
Chemistry
Question

SnCl2 gives white precipitate with HgCl2 which later on turns grey. Explain why?

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Solution
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SnCl2 is strong reducing agent and reduces HgCl2 to Hg2Cl2(white) which is further reduced to Hg (grey).
The reactions are as follows:
SnCl2+HgCl2⟶SnCl4+Hg2Cl2
SnCl2+Hg2Cl2⟶SnCl4+2Hg

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