Chemical Engineering Thermodynamics
In Joule-Thomson porous plug experiment, the

Entire apparatus is exposed to surroundings
Temperature remains constant
None of these
Enthalpy does not remain constant

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

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

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