Question

(a) If half life ** of a first order reaction is x and 3/4th life ** of the same reaction is y, how are x and y related to each other ?

(b) In some cases it is found that a large number of colliding molecules have energy more than threshold energy/ yet the reaction is slow. Why ?

Answer 1

(a) y = 2x.This is because for 3/4th of the reaction to complete, time required = two half lives.

(b) This is because of improper orientation of the colliding molecules at time of collision.