Chemical Engineering MCQs

Page No. 542

BET apparatus_______________________?


aMeasures the catalyst surface area directly


bOperates at very high pressure


cIs made entirely of stainless steel


dNone of these


View Answer None of these

The half life period of a first order reaction is given by (where, K = rate constant) ?


a1.5 K


b2.5 K


c0.693/K


d6.93 K


View Answer 0.693/K

The reason why a catalyst increases the rate of reaction is that, it______________?


aDecreases the energy barrier for reaction


bIncreases the activation energy


cDecreases the molecular collision diameter


dNone of these



A catalyst______________________?


aInitiates a reaction


bLowers the activation energy of reacting molecules


cIs capable of reacting with any one of the reactants


dCannot be recovered chemically unchanged at the end of a chemical reaction



The rate controlling step for the heterogeneous irreversible catalytic reaction A(g) + B(g) → C(g) is the surface reaction of absorbed A with absorbed B to give adsorbed C. The rate expression for this reaction can then be written as (where, KA, KB and KC are the equilibrium constants and is the rate constant of the rate controlling step) ?


ak KA pApB / (1 + KApA + KBpB)


bk KAKB pApB / (1 + KApA + KBpB)


ck KAKB pApB / (1 + KApA + KBpB + KCpC)


dk KAKB pApB / (1 + KApA + KBpB + KCpC)2



Reaction rate equation for the bellow figure reaction, If S at is present in large excess, what is the order of this reaction ?


aZero


bOne


cTwo


dThree


View Answer One

In the gaseous phase ammonia formation reaction (N2 + 3H2 ⇌ 2NH3), the value of the equilibrium constant depends on the_________________?


aTotal pressure of the system


bVolume of the reactor


cTemperature


dInitial concentration of N2 and H2


View Answer Temperature

For a heterogeneous catalytic reaction____________________?


aFree energy of activation is lowered in the presence of catalyst, which remains unchanged at the end of reaction


bA relatively small amount of catalyst can cause the conversion of large amount of reactants which does not mean that catalyst concentration is important


cThe catalyst does not form an intermediate complex with the reactant


dThe surface of the catalyst does not play an important role during reaction



For an isothermal second order aqueous phase reaction, A → B, the ratio of the time required for 90% conversion to the time required for 45% conversion is____________________?


a2


b4


c11


d22


View Answer 11

A photochemical reaction is _______________?


aAccompanied with emission of light


bCatalysed by light


cInitiated by light


dAll A., B. & C.


View Answer Initiated by light

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