Question

CO2(g) + C(s) \(\rightleftharpoons\) 2CO(g) is an example of _____________

(a) homogeneous equilibrium

(b) heterogeneous equilibrium

(c) neither homogeneous nor heterogeneous

(d) both homogeneous and heterogeneous

I had been asked this question in an international level competition.

Query is from Homogeneous Equilibria topic in division Equilibrium of Chemistry – Class 11

Answer 1

Right choice is (b) heterogeneous equilibrium

Easy explanation: In heterogeneous equilibrium, the reactants and products are present in two or more physical States or phases. Here carbon dioxide is present in the gaseous state while carbon is present in the solid state, so it is an example of heterogeneous equilibrium.