Assertion :In mercury cell, the cell potential is approximately $1.35$ V and remains constant during its life. Reason: The overall reaction in mercury cell is represented as $Z n (H g) + H g O_{(s)} \to Z n O_{(s)} + H g_{(l)}$

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 A Both Assertion and Reason are correct and Reason is the correct explanation for Assertion
A mercury battery (also called mercuric oxide battery, or mercury cell) is a non-rechargeable electrochemical battery, a primary cell. Mercury batteries use a reaction between mercuric oxide and zinc electrodes in an alkaline electrolyte. The voltage during discharge remains practically constant at 1.35 volts

Mercury batteries were used in the shape for watches, button cells hearing aids, cameras and calculators, and in larger forms for other applications.

The overall reaction in the mercury cell is:

$Z n (H g) + H g O_{(s)} \to Z n O_{(s)} + H g_{(l)}$

Since the overall reaction involved only pure liquid and solid so emf of the cell does not change during the course of the reaction.

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Assertion :In mercury cell, the cell potential is approximately 1.35V and remains constant during its life. Reason: The overall reaction in mercury cell is represented as Zn(Hg)+HgO(s)→ZnO(s)+Hg(l)

Assertion :In mercury cell, the cell potential is approximately $1.35$ V and remains constant during its life. Reason: The overall reaction in mercury cell is represented as $Z n (H g) + H g O_{(s)} \to Z n O_{(s)} + H g_{(l)}$