In which of the following reactions, the equilibrium reamins unaffected on addition of small amount of argon at constant volume?

Options

A. `H_2(g) +I_2(g) hArr 2HI(g)`
B. `PCl_5(g) hArrPCI_(3)(g) + Cl_2 (g)`
C. `N_2(g)+3H_2(g) hArr 2NH_3(g)`
D. The equilibrium will remain unaffected in all the three cases

Answer

D

Explanation

When an inert gas is added to the equilibrium system at constant volume, then the total pressure will increase. But the concentration of the reactants and products (ratio of their moles to the volume of the container) will not change. Hence, under these conditions, there will be no effect on the equilibrium in all the three cases.