Chemical Engineering Thermodynamics
Compressibility factor for almost all the gases are approximately same at the same

None of these
Critical pressure and critical temperature
Reduced pressure and reduced temperature
Pressure and temperature

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Chemical Engineering Thermodynamics
Law of corresponding states says that

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

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