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NEET UG CHEMISTRY MCQ: THERMODYNAMICS
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An ideal gas undergoing expansion in vacuum shows:
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Correct option: D
All of these
Option D is correct because in a vacuum expansion, no external pressure opposes the expansion, so no work is done (W=0), no heat is exchanged (q=0), and the internal energy remains constant (∆U=0).
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Reason :- During phase transition work done is always negative. For the reaction, at . Hence, is