Chemical Engineering Thermodynamics
The necessary and sufficient condition for equilibrium between two phases is

The chemical potential of each component should be same in the two phases
The concentration of each component should be same in the two phases
The temperature of each phase should be same
The pressure should be same in the two phases

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Chemical Engineering Thermodynamics
The third law of thermodynamics states that the

None of these
Gases having same reduced properties behave similarly
Heat capacity of a crystalline solid is zero at absolute zero temperature
Heat transfer from low temperature to high temperature source is not possible without external work

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