Assertion :Stannous chloride is a powerful oxidizing agent which oxidizes mercuric chloride to mercury. Reason: Stannous chloride gives a grey precipitate with mercuric but stannic chloride does not to do so.

Both assertion and reason are correct and reason is the correct explanation for assertion

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Both assertion and reason are correct but reason is not the correct explanation for assertion

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Assertion is correct but reason is incorrect

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Both assertion and reason are incorrect

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Solution

The correct option is C Assertion is correct but reason is incorrect
Stannous chloride is a powerful reducing agent which reduces mercuric chloride as:
$S n C l_{2} + 2 H g C l_{2} \to S n C l_{4} + H g_{2} C l_{2}$
oxidation reduction

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