Assertion :To obtain maximum work from a galvanic cell charge has to be passed reversibly. Reason: The reversible work done by a galvanic cell is equal to decrease in its Gibbs energy.

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.
Electrical work done in one second is equal to electrical potential multiplied by total charge.If we want to obtain maximum work from a galvanic cell then charge has to be passed reversibly. The reversible work done by a galvanic cell is equal to decrease in its Gibbs energy and therefore, if the emf of cell is E and nF is the amount of charge passedand $Δ G$ is the Gibbs energy of reaction then,
$Δ G = - n F E_{c e l l}$
Hence, both Assertion and reason are correct and also reason is the correct explanation for Assertion.

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