Chemical Engineering Thermodynamics
In case of vapour compression refrigeration system, elevating the evaporator temperature (keeping the condenser temperature constant) results in

No change in the value of COP
Decreased COP
Enhanced COP
Increased or decreased COP ; depending upon the type of refrigerant

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Chemical Engineering Thermodynamics
Law of corresponding states says that

The surface of separation (i. e. the meniscus) between liquid and vapour phase disappears at the critical temperature
The molar heat of energy of gas at constant volume should be nearly constant (about 3 calories)
No gas can be liquified above the critical temperature, howsoever high the pressure may be
, two different gases behave similarly, if their reduced properties (i.e. P, V and T) are same

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