Chemical Engineering Thermodynamics (MCQs)

Which of the following is not a reversible process ?

  • A. Expansion of an ideal gas against constant pressure
  • B. Atmospheric pressure vaporisation of water at 100°C
  • C. Solution of NaCl in water at 50°C
  • D. None of these
Answer: Option C.
Explanation: 
Since the entropy of mixing is positive we can say the mixing process or solution formation process is an irreversible process.

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