Chemical Engineering Thermodynamics
Critical solution temperature (or the con-solute temperature) for partially miscible liquids (e.g., phenol-water) is the minimum temperature at which

Two liquids are completely separated into two layers
None of these
Mutual solubility of the two liquids shows a decreasing trend
A homogeneous solution (say of phenol water) is formed

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Chemical Engineering Thermodynamics
Which of the following is an undesirable characteristics of a refrigerant ?

It should have a sub-atmospheric vapor pressure at the temperature in refrigerator coils
Its vapor pressure at the condenser temperature should be very high
None of these
It should be non-explosive

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