Assertion :Entropy change in reversible adiabatic expansion of an ideal gas is zero. Reason: The increase in entropy due to volume increase just compensate the decrease in entropy due to fall in temperature.

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 A Both Assertion and Reason are correct and Reason is the correct explanation for Assertion
As $Δ S = d q_{r e v} / T$ and as $d q = 0$ for reversible adiabatic expansion so, entropy change in reversible adiabatic expansion of an ideal gas is zero as increase in entropy due to volume increase just compensate the decrease in entropy due to fall in temperature.

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