Chemical Engineering Thermodynamics
The necessary condition for phase equilibrium in a multiphase system of N components is that the

Sum of the chemical potentials of any given component in all the phases should be the same
Chemical potentials of all components should be same in a particular phase
Chemical potentials of a given component should be equal in all phases
None of these

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

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