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Class 12 NEET Chemistry Chemical Kinetics Questions
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© examsnet.com
Question : 27
Total: 73
The decomposition of phosphine
(
P
H
3
)
on tungsten at low pressure is a first-order reaction. It is because the
[NEET 2016 P2]
Rate of decomposition is very slow
Rate is proportional to the surface coverage
Rate is inversely proportional to the surface coverage
Rate is independent of the surface coverage
Validate
Solution:
PH
3
w
–
–
–
–
–
–
>
P
+
3
2
H
2
Rate =
k
[
P
H
3
]
It is dependent of surface coverage because at low pressure, surface area covered is proportional to partial pressure of
PH
3
and it is first order w.r.t
PH
3
.
=
kP
1
−
k
P
= fraction of surface area covered at low pressure
= kP
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