Chemical Engineering Thermodynamics
Co-efficient of Performance (COP) of a refrigerator is the ratio of the

Refrigeration obtained to the work required
Higher to lower temperature
Lower to higher temperature
Work required to refrigeration obtained

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

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