Question

If KC of a reaction N2(g) + O2(g) \(\rightleftharpoons\) 2NO(g) is 2 x 10^-3, then what is the KP?

(a) 4 x 10^-3

(b) 1 x 10^-3

(c) 3 x 10^-3

(d) 2 x 10^-3

I had been asked this question by my school principal while I was bunking the class.

This interesting question is from Homogeneous Equilibria in section Equilibrium of Chemistry – Class 11

Answer 1

The correct choice is (d) 2 x 10^-3

For explanation: As we know that KC = KP(RT)^Δng, here Δng = moles of products – moles of reactants which are in gaseous state only = 2 – (1+1) = 0. So KC = KP(RT)^0, KC = KP(1) = KP; KC = KP, therefore KP is same as KC and KP is 2 x 10^-3.