Chemical Engineering Thermodynamics
The necessary and sufficient condition for equilibrium between two phases is

The temperature of each phase should be same
The chemical potential of each component should be same in the two phases
The concentration of each component should be same in the two phases
The pressure should be same in the two phases

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Chemical Engineering Thermodynamics
In the reaction, H₂ +I₂ ⇋ 2HI, addition of an inert gas will

Increase the partial pressure of I₂
Not effect the equilibrium conditions
Increase the partial pressure of H₂
Increase the total pressure and hence shift the equilibrium towards the right

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