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
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
None of these

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Chemical Reaction Engineering
In the reversible reaction of the type, A + B ⇋ AB, in general

Neither of the reactions will be en-dothermic
Both forward and backward reactions will be exothermic
The combination reaction will be endothermic, while the dissociation reaction will be exothermic
The combination reaction will be exothermic, while the dissociation reaction will be endothermic

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