In which of the following equilibrium Kc and Kp are not equal?

Question

In which of the following equilibrium K_c and K_p are not equal?

2NO_(g) $\rightleftharpoons$ N_2(g) + O_2(g)

SO_2(g) + NO_2(g) $\rightleftharpoons$ SO_3(g) + NO_(g)

H_2(g) + I_2(g) $\rightleftharpoons$ 2HI_(g)

2C_(s) + O_2(g) $\rightleftharpoons$ 2CO_2(g)

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