Question

So, it is seen that the destruction of ozone can be catalyzed by NO or by Cl. It has been found that the activation energy for the reaction catalyzed by Cl is 2 kJ/mol and for the reaction catalyzed by NO is 12 kJ/mol. Which is the more effective catalyst? Why?

Answer 1

More effective catalyst would be the one with the lower activation energy, which means it is Cl.
Collisions of the reagents must occur during the chemical reaction and a certain minimum energy called the activation energy is necessary for that reaction. Adding a catalyst has a function to increase the rate of a reaction by lowering that activation energy.