Question

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

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

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

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