Chemical Engineering Thermodynamics
The molar excess Gibbs free energy, gE, for a binary liquid mixture at T and P is given by, (gE/RT) = A . x₁. x₂, where A is a constant. The corresponding equation for ln y₁, where y₁ is the activity co-efficient of component 1, is

A . x₂²
Ax₁²
Ax₂
Ax₁

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Chemical Engineering Thermodynamics
Pick out the wrong statement pertaining to the decomposition of PCl5 represented by, PCl5 ⇋ PCl3 + Cl₂.Degree of dissociation of PCl5 will

Decrease on addition of Cl₂
Increase on addition of an inert gas at constant pressure
None of these
Decrease on increasing the pressure of the system

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