Chemical Engineering Thermodynamics (MCQs)

Entropy of the system decreases, when ___________?

  • A. Snow melts into water
  • B. A gas expands spontaneously from high pressure to low pressure
  • C. Water is converted into ice
  • D. Both B & C
Answer: Option D.
Explanation: 
Since, the degree of randomness decreases when the water is converted to ice the entropy decreases and also in an similar way when the gas is expanding from high pressure to low pressure the entropy increases.

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