Carbon monoxide and water react together in the industrial production of hydrogen gas.

$${\text{CO(g)}} + {{\text{H}}_{\text{2}}}{\text{O(g)}} \rightleftharpoons {\text{C}}{{\text{O}}_{\text{2}}}{\text{(g)}} + {{\text{H}}_{\text{2}}}{\text{(g)}}$$

What is the impact of decreasing the volume of the equilibrium mixture at a constant temperature?

A.     The amount of ${{\text{H}}_{\text{2}}}{\text{(g)}}$ remains the same but its concentration decreases.

B.     The forward reaction is favoured.

C.     The reverse reaction is favoured.

D.     The value of ${K_{\text{c}}}$ remains unchanged.

D