The half life period for catalytic decomposition of `AB_(3)` at 50 mm is found to be 4 hrs and at 100 mm it in 2 hrs. The order of reaction is :

Options

A. `3`
B. `1`
C. `2`
D. `0`

Answer

C

Explanation

When initial pressure of `AB_(3) = 100 mm`
`t_(1//2) = 2 hr`.
It means when concentration is doubled, half life is halved. So, it is a second order reaction.
For second order reaction: `t_(1//2) prop (a)^(-1)`