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

U is constant but S decreases
U and S both decreases
Its internal energy (U) decreases and its entropy (S) increases
U decreases but S is constant

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Chemical Engineering Thermodynamics
The third law of thermodynamics states that the

Heat capacity of a crystalline solid is zero at absolute zero temperature
Gases having same reduced properties behave similarly
None of these
Heat transfer from low temperature to high temperature source is not possible without external work

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