Chemical Engineering Thermodynamics
Which of the following is not a reversible process ?

Solution of NaCl in water at 50°C
None of these
Expansion of an ideal gas against constant pressure
Atmospheric pressure vaporisation of water at 100°C

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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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