Chemical Engineering Thermodynamics
The equation DU = Tds - PdV is applicable to infinitesimal changes occuring in

An open system of constant composition
An open system with changes in composition
A closed system with changes in composition
A closed system of constant composition

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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
Mutual solubility of the two liquids shows a decreasing trend
Two liquids are completely separated into two layers
None of these

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