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

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

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Chemical Engineering Thermodynamics
A refrigeration cycle is a reversed heat engine. Which of the following has the maximum value of the co-efficient of performance (COP) for a given refrigeration effect?

Carnot refrigeration cycle
Vapor compression cycle using expansion valve
Vapor compression cycle using expansion engine
Air refrigeration cycle

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Chemical Engineering Thermodynamics
The second law of thermodynamics states that

The total energy of system and surrounding remains the same
It is not possible to transfer heat from a lower temperature to a higher temperature
The energy change of a system undergoing any reversible process is zero
None of these

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