NEET 2016 Physics and Chemistry Paper 2

PH3

w

––––––>

P+

3

2

H2
Rate = k[PH3]
It is dependent of surface coverage because at low pressure, surface area covered is proportional to partial pressure of PH3 and it is first order w.r.t PH3 .
=

kP

1−kP

= fraction of surface area covered at low pressure
= kP