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(D) The equilibrium constant $K_c$ depends on the units of concentration if the change in the number of moles of gaseous species,$\Delta n_g$,is non-z

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$COCl_{2(g)} \rightleftharpoons CO_{(g)} + Cl_{2(g)}$

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(D) The equilibrium constant $K_c$ depends on the units of concentration if the change in the number of moles of gaseous species,$\Delta n_g$,is non-zero.For option $A$: $\Delta n_g = (0.5 + 0.5) - 1 = 0$.For option $B$: $\Delta n_g = 0$ (as only aqueous species are involved in the expression).For option $C$: $\Delta n_g = 0$ (as liquid species are not included in the $K_c$ expression).For option $D$: $\Delta n_g = (1 + 1) - 1 = 1$.Since $\Delta n_g 
eq 0$ for reaction $D$,the equilibrium constant $K_c$ depends on the units of concentration.

For which of the following reactions does the equilibrium constant depend on the units of concentration?

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Assertion : For reaction $N_{2(g)} + 3H_{2(g)} \rightleftharpoons 2NH_{3(g)}$,the unit of $K_C$ is $L^2 \, mol^{-2}$.
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$2 \ mol$ of $PCl_5$ is heated in a closed vessel of $2 \ L$ capacity. When equilibrium is attained,$PCl_5$ is $40\%$ dissociated. The equilibrium constant $K_c$ for the reaction will be ........... $mol/L$.

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