Which one of the following statements regarding catalysis in not true ?

Options

A. A small amount of the catalyst can catalyse a large amount of reactants.
B. A catalyst does not alter Gibbs energy, `Delta_(r)G^(@)` of a reaction
C. It catalyses the spontaneous but does not catalyse non-spontaneous reactions.
D. A catalyst changes the equilibrium constant of a reversible reaction.

Answer

D

Explanation

Catalyst does not change the equilibrium constant of a reverible reaction, rather it helps in attaining th equilibrium faster because it catalyes the forward as well as the backward reactions to the same exent so that the equilibrium state remains the same extent so but is attained erlier.
A Small amount of the catalyst is needed because a catalyst does not take part in the overall reaction, but all of it is reformed in later steps. Thus, a catalyst does not appear in the balanced equation for the reaction.