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Q.

An ideal gas undergoes a reversible isothermal expansion from state I to state II followed by a reversible adiabatic expansion from state II to state III. The correct plot(s) representing the changes from state I to state III is(are)
(p: pressure, V: volume, T: temperature, H : enthalpy, S: entropy)

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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, B, D.

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Detailed Solution

Question Image

(1) correct

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(2) correct

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(3)

Since enthalpy change of ideal gas only depends upon temperature I $\to$ II (correct)

But In adiabatic expansion temperature will decrease so enthalpy should decrease
II $\to$ III (incorrect)
So the graph is incorrect.

Question Image

I $\to$ II correct
II $\to$ III correct
So the graph is correct

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An ideal gas undergoes a reversible isothermal expansion from state I to state II followed by a reversible adiabatic expansion from state II to state III. The correct plot(s) representing the changes from state I to state III is(are) (p: pressure, V: volume, T: temperature, H : enthalpy, S: entropy)