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?

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
Langmuir

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Chemical Reaction Engineering
In an ideal P.F.R. at steady state conditions

The composition of reactants remains constant along a flow path
There is no lateral mixing of fluid
There may be diffusion along the flow path
The conversion of the reactant varies from point to point along a flow path

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