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

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
The chemical potential of each component should be same in the two phases

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Chemical Engineering Thermodynamics
Which of the following will increase the volume of a real gas by four times ?

Reducing pressure to one fourth at constant temperature
Reducing the temperature to half and doubling the pressure
Doubling the absolute temperature as well as pressure of the gas
Reducing temperature to one fourth at constant pressure

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