Q. In which of the following equilibrium Kc and Kp are not equal?
A) 2C(s) + O₂(g) ⇌ 2CO(g)
B) 2NO(g) ⇌ N₂(g) + O₂(g)
C) SO₂(g) + NO₂(g) ⇌ SO₃(g) + NO(g)
D) H₂(g) + I₂(g) ⇌ 2HI(g)
Explanation
[Solution from source] K_p = K_c(RT)^Δn_g. For 2C(s) + O₂(g) ⇌ 2CO(g), only gases count: Δn_g = 2 − 1 = 1, so K_p ≠ K_c. In the other three reactions the moles of gas are the same on both sides (Δn_g = 0). Answer (1).
Reviewed by Dr. Abubacker
Physics Educator & NEET/JEE Specialist
Ph.D. in Physics with 19+ years of teaching experience.