Chemical Reaction Engineering
For a first order isothermal chemical reaction in a porous catalyst, the effectiveness factor is 0.3. The effectiveness factor will increase if the

Catalyst size is reduced or the catalyst diffusivity is reduced
Catalyst size is increased or the catalyst diffusivity is increased
Catalyst size is increased or the catalyst diffusivity is reduced
Catalyst size is reduced or the catalyst diffusivity is increased

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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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Chemical Reaction Engineering
For a heterogeneous catalytic reaction

Free energy of activation is lowered in the presence of catalyst, which remains unchanged at the end of reaction
A relatively small amount of catalyst can cause the conversion of large amount of reactants which does not mean that catalyst concentration is important
The catalyst does not form an intermediate complex with the reactant
The surface of the catalyst does not play an important role during reaction

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