Chemical Engineering MCQs

Page No. 583

B.E.T. method can be used to determine the ___________________ of a porous catalyst?


aSolid density


bPore volume


cSurface area


dAll A., B. and C.


View Answer Surface area

In an exothermic reaction, the energy of the reacting substances as compared to that of products is____________________?


aMore


bLess


cSame


dEither A. or B., depends on order of reaction


View Answer More

Semibatch reactor is preferred, when a/an__________________?


aA highly exothermic reaction is to be controlled


bUndesirable side reaction (at high concentration of one of the reactants) is to be avoided


cA gas is to be reacted with liquid (e.g. hydrogenation of fat)


dAll A., B., and C.


View Answer All A., B., and C.

The half life period ‘t’ of a zero order reaction as shown in the bellow figure, is equal to_________________?


aCA0/2K


bCA0/K


c0.693/K


d1/K


View Answer CA0/2K

If a solid-gas non-catalytic reaction occurs at very high temperature, the rate controlling step is the ________________ diffusion?


aFilm


bAsh layer


cPore


dNone of these


View Answer Film

Variables affecting the rate of homogeneous reactions are___________________?


aPressure and temperature only


bTemperature and composition only


cPressure and composition only


dPressure, temperature and composition



In a zero order reaction, reactants concentration does not change with time and the_________________?


aTime for half change is half the time taken for completion of the reaction


bTime for half change is independent of the initial concentration


cTime for completion of the reaction is independent of the initial concentration


dReaction rate is trebled when the initial concentration is trebled



In case of the irreversible unimolecular type, first order reaction, the fractional conversion at any time for constant volume system as compared to variable volume system is___________________?


aMore


bLess


cSame


dEither A. or B., depends on other factors


View Answer Same

Volume change for unimolecular type first order reaction as shown in the bellow figure, increases _____________ with time?


aLinearly


bExponentially


cParabolically


dLogarithmically


View Answer Exponentially

Brunauer, 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 ?


aLangmuir’s assumption applies to every adsorbed layer


bThere is no dynamic equilibrium between successive layer


cThe 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


dNone of these



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