Chemical Engineering Thermodynamics
Gibbs-Duhem equation

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
None of these
Applies only to binary systems

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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
A homogeneous solution (say of phenol water) is formed
Mutual solubility of the two liquids shows a decreasing trend
None of these

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Chemical Engineering Thermodynamics
The third law of thermodynamics states that the

Gases having same reduced properties behave similarly
Heat transfer from low temperature to high temperature source is not possible without external work
Heat capacity of a crystalline solid is zero at absolute zero temperature
None of these

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