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Question:

What happens when an inert gas is added to an equilibrium keeping volume unchanged?

Less product will form

Equilibrium will remain unchanged

More product will form

More reactant will form

Solution:

When an inert gas is added to the system in equilibrium at constant volume, the total pressure will increase. But the concentrations of the products and reactants (i.e. ratio of their moles to the volume of the container) will not change. Hence, when an inert gas is added to the system in equilibrium at constant volume there will be no effect on the equilibrium.