Specific/molar Gibbs free energy for a pure substance does not change during

Specific/molar Gibbs free energy for a pure substance does not change during Correct Answer Either A, B or C

During the phase change the gibbs free energy doesn’t change since the pressure and temperature are remained constant during phase change.
For single component and closed system : $$dG = VdP - SdT$$
Bissoy MCQ

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