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

ANSWER DOWNLOAD EXAMIANS APP

Chemical Reaction Engineering
A catalyst loses its activity due to

All of these
Covering of the catalytic active sites by a foregin substance
Agglomeration of metal particles caused by thermal sintering of the solid surface
Loss in surface area of the active component

ANSWER DOWNLOAD EXAMIANS APP

Chemical Reaction Engineering
Which of the following is not a dimension-less group used in catalysis ? (where, D = dispersion co-efficient, cm² /sec.D1 = diffusion co-efficient; cm²/sec L = length of the reactor, cm t = time, sec, v = volumetric flow rate, cm³/sec . V = volume, cm³.)

None of these
Reactor dispersion number (D/vL)
Thiele modulus (L√(k/D1)
Reduced time (vt/V)

ANSWER DOWNLOAD EXAMIANS APP
MORE MCQ ON Chemical Reaction Engineering