Q124 · CSIR-NET Chemistry, December 2015

Paper: CSIR-NET December 2015 · Subject: Physical Chemistry · Chapter: Thermodynamics · Topic: Free Energy Equilibria · Marks: 2 · Difficulty: Easy

The non-spontaneous process among the following is
(a)vapourisation of superhead water at 105°C and 1 atm pressure
(b)expansion of a gas into vacuum freezing
(c)freezing of supercooled water at -10°C and 1 atm pressure
(d)freezing of water at 0°C and 1 atm pressure.
Answer
Answer: D ✓ checked by 4AB · confidence high
Explanation
Freezing at 0 °C, 1 atm is an equilibrium, not a spontaneous process (d).

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