Chemistry - Chemical Kinetics Question with Solution | TestHub

For a zero order reaciton,${\text{t}}_{\text{1/2}}\propto \text{initial}\text{concentration}$
$\Rightarrow {\text{t}}_{\text{1/2}}\propto \text{pressure}$
Since, half life decreases to half with similar decrease in pressure. Hence, the order of reaction is zero.