Chemical Engineering Thermodynamics
Claussius-Clayperon equation gives accurate result, when the

Volume in the liquid state is negligible compared with that in the vapour state
Vapour pressure is relatively low and the temperature does not vary over wide limits
Vapour obeys the ideal gas law and the latent heat of vaporisation is constant
All of these

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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

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

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