Question

Which of the following statements is more correct?

• A. A catalyst only accelerates the rate of a chemical reaction.
• B. A catalyst can retard the rate of a chemical reaction.
• C. A catalyst can control the speed of a reaction.
• D. A catalyst alters the speed of a reaction.

Answer 1

The correct option is D A catalyst alters the speed of a reaction.

A catalyst is a substance which increases (accelerate) the rate of reaction.But is not consumed by the reaction; hence a catalyst can be recovered chemically unchanged at the end of the reaction it has been used to speed up, or catalyze.