Question

If KC > 10x, the products predominate over reactants. Then what is the value of x?

(a) 2

(b) 3

(c) 4

(d) 1

I have been asked this question in an online interview.

This interesting question is from Applications of Equilibrium Constants topic in division Equilibrium of Chemistry – Class 11

Answer 1

Right choice is (b) 3

To explain I would say: If KC > 10x, the products are predominant, over the reactants in a chemical reaction because if KC is very large the reaction proceeds nearly to completion an example for this is at 300K,  H2(g) + Cl2(g) \(\rightleftharpoons\) 2HCl(g), KC = 4 x 10^31.