Assertion :The cell potential of mercury cell is $1.35 V$ , which remains constant. Reason: In mercury cell, the electrolyte is a paste of $K O H$ and $Z n O$ .

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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Assertion is incorrect but Reason is correct.

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Solution

The correct option is B Both Assertion and Reason are correct but Reason is not the correct explanation for Assertion.
$Z n (H g) + H g O (s) \to Z n O (s) + H g (l)$

The cell potential remains constant during its life as the overall reaction does not involve any ion in the solution whose concentration may change during its life time.

Reason is a factual statement. It's not the correct explanation for the assertion.
Hence, option B is correct.

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