MEDIUMMCQ SINGLEJEE Mains ChemistryPhysical ChemistryChemical kineticsPrevious Year Questions
The decomposition of phosphine (PH3) on tungsten at low pressure is a first-order reaction. It is because the: (NEET II 2016)
A.Rate is proportional to the surface coverage✓ Correct
B.Rate is inversely proportional to the surface
C.Rate is independent of the surface coverage
D.Rate of decomposition is very slow
Explanation
At low pressure, rate is proportional to the surface coverage and is of first order while at high pressure, it follows zero order kinetics due to complete coverage of surface area.
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