Chemical Reaction Engineering
Brunaur, Emmet and Teller (BET) equation is used to determine the specific surface area of a porous particle but not the pore volume & the porosity of the catalyst bed. Which of the following postulates is not used to derive BET equation?

Langmuir
There is no dynamic equilibrium between successive layer
None of these
The adsorbed layer may be polymolecular in thickness and the heat of adsorption in each layer (except the first one) is involved in each of the evaporation process

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Chemical Reaction Engineering
In solid catalysed reactions the diffusional effects are more likely to affect the overall rate of reaction for

Fast reaction in catalyst of large pore diameter
Slow reactions in catalyst of large pore diameter
Fast reactions in catalyst of small pore diameter
Slow reactions in catalyst of small pore diameter

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Chemical Reaction Engineering
The experimentally determined overall order of the reaction, A + B → C + D, is two. Then the

Reaction is elementary with a molecularity of 2
Reaction may be elementary with molecularity of 2
Molecularity of the reaction is 2, but the reaction may not be elementary
Reaction is elementary but the molecularity may not be 2

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