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The pair of compounds that can exist together is:

1. FeCl3, SnCl2
2. HgCl2, SnCl2
3. FeCl2, SnCl2
4. FeCl3, KI

Correct answer: HgCl2, SnCl2

Solution

HgCl2 and SnCl2 can coexist because HgCl2 is a non-oxidizing agent, and SnCl2 is a mild reducing agent, so they do not react with each other under normal conditions.

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