Consider the following two statements and choose the correct answer.
(I) If heat is added to a system, its temperature must always increase.
(II) If positive work is done by a system in thermodynamic process, its volume must increase.

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Both I and II are correct

I is correct, but II is incorrect

II is correct, but I is incorrect

Both I and II are incorrect

answer is C.

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Detailed Solution

If heat is added to the system, temperature may not increase (e.g. when change of state occurs) but expansion $∆ V$ is positive if work done is positive.

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