✔ Correct Answer: A. N2(g) + 3H2(g) ⇌ 2NH3(g)

The correct answer to the question “For which system does the equilibrium constant, Kc has units of concentration.” is N2(g) + 3H2(g) ⇌ 2NH3(g). This question belongs to Everyday Science. Practice the related questions below to master this topic for your FPSC, PPSC and NTS tests.