NEET Chemistry Chemical Kinetics Questions Solved

NEET - 2016

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

(a) rate is proportional to the surface coverage

(b) rate is inversely proportional to the surface coverage

(c) rate is independent of the surface coverage

(d) rate of decomposition is very slow

(a) PH3 wP +3/2. H2

This is an example of surface catalysed unimolecular decomposition.

For the above reaction, rate is given as

 Rate = kαρ/1+αρ

where, ρ = partial pressure of absorbing substrate.

At low pressure, αρ

 

 

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