Chemical Engineering Thermodynamics
Gibbs-Duhem equation

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

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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

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

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