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During a reversible isothermal expansion of an ideal gas the entropy...

This question belongs to Chemical Engineering Chemical Engineering Thermodynamics
Chemical Engineering Thermodynamics
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During a reversible isothermal expansion of an ideal gas, the entropy change is

Answer & Solution
Correct Answer: Option A
We know the change in entropy $$dS = \frac{{\delta Q}}{T}$$   and for expansion since the heat has to be added to the system and by our convention heat added to the system isothermally is positive so change in entropy is positive.
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