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Q.

Three moles of an ideal gas CP = 7/2R at pressure PA and temperature TA is isothermally expanded to twice its initial volume. It is then compressed at constant pressure to its original volume. Finally the gas is heated at constant volume to its original pressure PA. The correct P-V and P-T diagrams indicating the process are

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a

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b

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c

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d

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answer is A, C.

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Detailed Solution

Let the process start from initial pressure PA, volume VA and temperature TA.

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I: Isothermal expansion (PV = constant) at temperature TA to twice the initial volume VA.
II: Compression at constant pressure PA/2 to original volume VA (i.e., V∝T)
III: Isochoric process (at volume VA) to initial conditions (i.e., P∝T)

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