Chemical Engineering Thermodynamics
The main feature of Carnot refrigeration cycle is that, it

Does not need the addition of external work for its functioning
Transfers heat from high temperature to low temperature
None of these
Accomplishes the reverse effect of the heat engine

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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
, two different gases behave similarly, if their reduced properties (i.e. P, V and T) are same
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

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