📊 Chemical Engineering Thermodynamics
Q. A closed system is cooled reversibly from 100°C to 50°C. If no work is done on the system
  • (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
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✅ Correct Answer: (B) U and S both decreases

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