Chemical Engineering Thermodynamics
PVy = constant, holds good for an isentropic process, which is

Adiabatic and irreversible
Isothermal and irreversible
Reversible and isothermal
Reversible and adiabatic

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

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

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