Chemical Reaction Engineering
In Langmuir treatment of adsorption,

Extent of adsorption is more than one complete monomolecular layer on the surface
Whole surface of the catalyst does not have the same activity for adsorption and there is attraction between the adsorbed molecule
All the adsorption does not take place by the same mechanism
Whole surface of the catalyst is essentially uniform and the adsorbed molecule has no effect on the rate of adsorption per site

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Chemical Reaction Engineering
In a zero order reaction, reactants concentration does not change with time and the

Time for completion of the reaction is independent of the initial concentration
Reaction rate is trebled when the initial concentration is trebled
Time for half change is half the time taken for completion of the reaction
Time for half change is independent of the initial concentration

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