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
Correct Answer: Solution of NaCl in water at 50°C
Since the entropy of mixing is positive we can say the mixing process or solution formation process is an irreversible process.