Q36 · 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 $105^{\circ}C$ and 1 atm pressure
(b)expansion of a gas into vacuum freezing
(c)freezing of supercooled water at $-10^{\circ}C$ and 1 atm pressure
(d)freezing of water at $0^{\circ} \mathrm{C}$ and 1 atm pressure.
Answer
Answer: D ✓ checked by 4AB · confidence high
Explanation
Freezing of water at 0 °C and 1 atm is an equilibrium process (ΔG = 0), not spontaneous; the other three are spontaneous (d).
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