For which system does the equilibrium constant, Kc has units of concentration....? Mcqs

For which system does the equilibrium constant, Kc has units of concentration....?

(A) N2(g) + 3H2(g) ⇌ 2NH3(g)

(B) N2(g) + 02(g) ⇌ 2NO

(C) H2(g) +12(g) ⇌ 2HI(g)

(D) CO2(g) + H3(g) ⇌ CO + H2O(l)