Chemical Engineering Thermodynamics
Critical temperature is defined as the temperature above which a gas will

Not liquify (barring exceptions)
None of these
Immediately liquify
Never liquify however high the pressure may be

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Chemical Engineering Thermodynamics
An irreversible process

Is an idealised visualisation of behaviour of a system
Yields an amount of work less than that of a reversible process
Is the analog of linear frictionless motion in machines
Yields the maximum amount of work

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Chemical Engineering Thermodynamics
It is desired to bring about a certain change in the state of a system by performing work on the system under adiabatic conditions.

The amount of work needed is independent of path
The amount of work needed is path dependent
Work alone can not bring out such a change of state
More information is needed to conclude anything about the path dependence or otherwise of the work needed

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