Discussion
Which of the following statement is not true about a catalyst?
Answer: D
The untrue statement is It catalyses the non-spontaneous reactions.
A catalyst lowers the activation energy, providing a faster route, but it does not change \(\Delta G\) or the equilibrium constant. It can therefore only speed up reactions that are already thermodynamically feasible; it cannot make a non-spontaneous reaction go.
The other statements are true: catalysts speed up spontaneous reactions, a small amount suffices because it is regenerated, and it leaves both the Gibbs energy change and \(K\) unchanged.
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