Chemical Engineering MCQs

Page No. 583

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


aSolid density

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bPore volume

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cSurface area

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dAll A., B. and C.

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View Answer Surface area

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


aMore

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bLess

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cSame

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

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View Answer More

Semibatch reactor is preferred, when a/an__________________?


aA highly exothermic reaction is to be controlled

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

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

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dAll A., B., and C.

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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

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bCA0/K

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c0.693/K

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d1/K

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View Answer CA0/2K

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


aFilm

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bAsh layer

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cPore

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dNone of these

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View Answer Film

Variables affecting the rate of homogeneous reactions are___________________?


aPressure and temperature only

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bTemperature and composition only

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cPressure and composition only

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dPressure, temperature and composition

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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

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bTime for half change is independent of the initial concentration

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

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dReaction rate is trebled when the initial concentration is trebled

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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

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bLess

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cSame

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dEither A. or B., depends on other factors

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View Answer Same

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


aLinearly

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bExponentially

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cParabolically

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dLogarithmically

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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

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bThere is no dynamic equilibrium between successive layer

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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

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dNone of these

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