Question

The half life period of n^th order reaction varies inversely to ____________ ^th power of the initial concentration of the reactants.

(a) n

(b) 2n

(c) (n+1)

(d) (n-1)

I had been asked this question in final exam.

My doubt stems from Integrated Rate Equation and Half Lives topic in section Reaction Dynamics of Engineering Chemistry I

Answer 1

Correct choice is (d) (n-1)

Easy explanation: The half life period of n^th order reaction varies inversely to (n-1) ^th power of the initial concentration of the reactants. The half-life of a reaction describes the time needed for half of the reactant to be depleted.