NEET 2016
- Exam
- NEET
- Year
- 2016
- Subject
- Chemistry
- Chapter
- Chemical Kinetics
NEET 2016 · Chemistry · Chemical Kinetics
The decomposition of phosphine (P H _ 3 ) on tungsten at low...
The decomposition of phosphine on tungsten at low pressure is a first-order reaction. It is because the
Options
- Arate is proportional to the surface coverage.
- Brate is inversely proportional to the surface coverage.
- Crate is independent of the surface coverage.
- Drate of decomposition is very slow.
Correct answer
A. rate is proportional to the surface coverage.
Step-by-step solution
The rate is proportional to the surface coverage.
When pressure is so low that ,
Rate = \dfrac{{k}_{r}\alpha p}{1 + \alpha p} \approx {k}_{r}\alpha p$.
When pressure is so low that ,
Rate = \dfrac{{k}_{r}\alpha p}{1 + \alpha p} \approx {k}_{r}\alpha p$.