Which of the following curves represents a third order reaction ?

Options

A.
B.
C.
D.

Answer

D

Explanation

The time required to complete a definite fraction (say one half) of the reaction depends on the intial concentration of the reactant in the following way:
For zero order reaction, `t_(1//2)prop(1)/(a^(-1))`
For first order reaction, `t_(1//2)` is independent of the initial concentration , a (second graph)`
i.e., `t_(t//2)prop(1)/(a^(0))`
For second order reaction, `t_(t//2)prop(1)/(a)` (third graph).
For third order reaction, `t_(1//2)prop(1)/(a^(2))` (fourth graph) .
For `n^(th)` order reaction `t_(1//2)prop(1)/(a^(n-1))`