Question

Half-life of a reaction is found to be inversely proportional to the cube of initial concentration. The order reaction is

• A. 2
• B. 5
• C. 3
• D. 4

Answer 1

The correct option is D 4

$t_0.5\propto \frac{1}{a^{n-1}}$
Given $t_0.5\propto \frac{1}{a^3}$
Hence, $n-1=3$
$\therefore n=4$