Which of the following statements must be true of a catalyst in a reaction mechanism?
I. is consumed in an elementary step
II. is regenerated in an elementary step after it is consumed
III. is included in the overall balanced reaction equation

Question

Quizplus · Accepted Answer

Statement I must be true because a catalyst is consumed in an elementary step, as it is necessary for the reaction to proceed. Statement II must be true because a catalyst is regenerated in an elementary step after its consumption. However, statement III is not necessarily true because catalysts are not always included in the overall balanced equation; they are written above the reaction arrow. Therefore, the correct answer is D.

Which of the Following Statements Must Be True of a Catalyst