Chemical Engineering Thermodynamics
The third law of thermodynamics states that the

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

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Chemical Engineering Thermodynamics
Which of the following is an undesirable characteristics of a refrigerant ?

It should be non-explosive
None of these
Its vapor pressure at the condenser temperature should be very high
It should have a sub-atmospheric vapor pressure at the temperature in refrigerator coils

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