The action of a catalyst can be explained in the following manner: the catalyst lowers the temperature of the reactants. the catalyst takes no part in the reaction but serves as a buffer between reactants and products. the catalyst prevents the reverse reaction. the catalyst makes it possible for the reaction to take place by another path that makes possible reaction at a lower energy.

Option (D) is the correct answer.

Explanation:

A catalyst is defined as the substance which lowers the activation energy of a chemical reaction without itself getting consumed so that there will be increase in rate of reaction.

As catalyst lowers the activation energy so, a new path is formed for the reactant molecules and then particles with lower energy also become able to participates in the reaction. Hence, more number of collisions occur due to which there is rapid formation of products.

Thus, we can conclude that the action of a catalyst can be explained in the following manner the catalyst makes it possible for the reaction to take place by another path that makes possible reaction at a lower energy.

a:

by the combination of an unlimited number of elements