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Question

The decomposition of phosphine (PH3) on tungsten at low pressure is a first-order reaction. It is because the


Your Answer
A
rate is independent of the surface coverage
Your Answer
B
rate of decomposition is very slow
Correct Answer
C
rate is proportional to the surface coverage
Your Answer
D
rate is inversely proportional to the surface coverage

Solution

The correct option is A rate is proportional to the surface coverage
The decomposition of PH3 on tungsten at low pressure is a first order reaction because rate is proportional to the surface coverage and at low pressure, the surface area coverage is proportional to the partial pressure of PH₃.

While as higher and higher pressures are reached, a certain increase in the pressure doesn't lead to an increase in the rate by the same factor because a correspondingly equivalent increase in surface coverage is not achieved.

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