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Area enclosed by a cycle on P-V diagram is same as on T-S diagram.

ΔS=nCpm ln T2T1 can be used in isobaric process for both ideal and real gas.

ΔS=nCpm ln T2T1+nR ln P1P2 is applicable for both reversible and irreversible process for an ideal gas not undergoing any chemical and phase change.

Work done on a diatomic gas will be more than monoatomic gas compressed reversible adiabatically from initial state to same final volume.

answer is A.

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Detailed Solution

(1) CorrectFor cyclic processq=-WArea under curve = qcycleArea under curve = Wcycle(2) ds=δqrevT=nCpdTTΔS=nCplnT2T1valid for solid liq/gasFor isobaric process (Correct)(3) ΔS=nCVlnT2T1+nR lnV2V1=T2T1P1P2ΔS=nCPlnT2T1+nRnP1P2 (correct)WMono>WDi (correct)

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