Question

A large increase in the rate of a reaction for a rise in temperature is due to ……

(a) the decrease in the number of collisions 

(b) increase in the number of activated molecules 

(c) the shortening of mean free path 

(d) the lowering of activation energy

Answer 1

(b) increase in the number of activated molecules

Answer 2

An increase in the rate of a reaction for a rise in temperature is due to  increase in collision frequency, shortening of mean free path and increase in the number of activated molecules.

Increasing the temperature increases reaction rates because of the disproportionately large increase in the number of high energy collisions. It is only these collisions (possessing at least the activation energy for the reaction) which result in a reaction.

∴Answer is (B)