Chemical Engineering Thermodynamics
The necessary condition for phase equilibrium in a multiphase system of N components is that the

None of these
Sum of the chemical potentials of any given component in all the phases should be the same
Chemical potentials of a given component should be equal in all phases
Chemical potentials of all components should be same in a particular phase

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Chemical Engineering Thermodynamics
Free energy

Decreases in all spontaneous (or irreversible) processes
All of these
Change during a spontaneous process has a negative value
Remains unchanged in reversible processes carried at constant temperature and pressure

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