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

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

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Chemical Engineering Thermodynamics
Gibbs-Duhem equation

Applies only to binary systems
States that n₁dμ₁ + n₂dμ₂ + ....njdμj = 0, for a system of definite composition at constant temperature and pressure
Finds no application in gas-liquid equilibria involved in distillation
None 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

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

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