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

(a) 2NO(g) ⇋ N2(g) + O2(g)

(b) SO2(g) + NO2(g) ⇋ SO3(g) + NO(g)

(c) H2(g) + I2(g) ⇋ 2HI(g)

(d) 2C(s) + O2(g) ⇋ 2CO2(g)

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The correct option is : (d) 2C(s) + O2(g) ⇋ 2CO2(g)


Kp and Kc are related by the equation, K= Kc(RT)Δng 

when Δng = difference in the no. of moles of products and reactants in the gaseous state.

for 2C(s) + O2(g) ⇋ 2CO2(g) 

Δng = 2 - (1) = 1 ≠ 0

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