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NEET UG CHEMISTRY MCQ: THERMODYNAMICS
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A gaseous reaction was carried out, first keeping the volume constant and next keeping the pressure constant. In the second experiment, there was an increase in volume. The heats of reaction were different, because :
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Correct option: B
In the second case energy was spent to expand the gases
Option B (In the second case energy was spent to expand the gases) is correct because at constant pressure, the system does work against the external pressure as the volume increases, requiring energy.
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Reason :- During phase transition work done is always negative. For the reaction, at . Hence, is