Chemical Reaction Engineering
An endothermic aqueous phase first order irreversible reaction is carried out in an adiabatic plug flow reactor. The rate of reaction

Is maximum at the inlet of the reactor
Goes through a minimum along the length of the reactor
Is maximum at the exit of the reactor
Goes through a maximum along the length of the reactor

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Chemical Reaction Engineering
In Langmuir treatment of adsorption,

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
Extent of adsorption is more than one complete monomolecular layer on the surface

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