A closed system is cooled reversibly from 100°C to 50°C. If no work is done on

Question

A closed system is cooled reversibly from 100°C to 50°C. If no work is done on the system

Options:

A . Its internal energy (U) decreases and its entropy (S) increases

B . U and S both decreases

C . U decreases but S is constant

D . U is constant but S decreases

Answer: Option B

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