A catalyst :

Options

A. Increases the average kinetic energy of reacting molecules
B. Decreases the activation energy
C. Alters the reaction mechanism
D. Increases the frequency of collisions of reacting species

Answer

bc

Explanation

A catalyst provides the path of lower activation energy . The catalyst reacts with the reactions to form an intermediate of low activation energy . The intermediate then decomposes to form the product along with regeneratoin of catalyst . Thus the reaction mechanism changes completely .