For which of the reactions would a change in pressure not shift the equilibrium concentration?
A) N2(g) + O2(g) ←→2NO(g) Kp = 2 x 10-2
B) P4(g) + 5O2(g) ←→P4O10(s) Kc = 0.05
C) CH4(g) + 2O2(g) ←→CO2(g) Kp = 6 x 103
D) Br2(g)←→2Br(g) Kp = 9 x 10-15
Answer: A