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Chemical Kinetics question

2016 · Q93
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Chemical Kinetics question

2016 · Q93

NEETChemistryChemical KineticsMCQ+4 / −1
The decomposition of phosphine (PH3) on tungsten at low pressure is a first-order reaction. It is because the
  1. A
    rate is proportional to the surface coverage
  2. B
    rate is inversely proportional to the surface coverage
  3. C
    rate is independent of the surface coverage
  4. D
    rate of decomposition is very slow.
View written solutionFree

Correct answer: A

At low pressure, rate is proportional to the surface coverage and is of first order while at high pressure it follows zero order kinetic due to complete coverage of surface area.

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