STATEMENT-1: Entropy change in reversible adiabatic expansion of an ideal gas is zero.
STATEMENT-2 : The increase in entropy due to volume increase just compensate the decrease in entropy due to fall in temperature.

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If both the statement are TRUE and STATEMENT-2 is the correct explanation of STATEMENT-1

If both statement are TRUE and STATEMENT-2 is NOT the correct explanation of STATEMENT-1

If STATEMENT-1 is TRUE and STATEMENT-2 is FALSE

IF STATEMENT-1 is FALSE and STATEMENT-2 is TRUE

answer is A.

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Detailed Solution

Since dq=0 the change in entropy equals zero $△ S = d q_{r e v} / T$
Volume increases in expansion so entropy increases in order to maintain equilibrium the entropy is decreased by fall in temperature

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