Chemical Engineering MCQs

Page No. 542

BET apparatus_______________________?


aMeasures the catalyst surface area directly

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bOperates at very high pressure

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cIs made entirely of stainless steel

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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

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b2.5 K

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c0.693/K

✓


d6.93 K

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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

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cDecreases the molecular collision diameter

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dNone of these

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A catalyst______________________?


aInitiates a reaction

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bLowers the activation energy of reacting molecules

✓


cIs capable of reacting with any one of the reactants

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

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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)

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bk KAKB pApB / (1 + KApA + KBpB)

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

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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

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bOne

✓


cTwo

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dThree

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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

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bVolume of the reactor

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cTemperature

✓


dInitial concentration of N2 and H2

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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

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cThe catalyst does not form an intermediate complex with the reactant

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

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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

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b4

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c11

✓


d22

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View Answer 11

A photochemical reaction is _______________?


aAccompanied with emission of light

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bCatalysed by light

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cInitiated by light

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dAll A., B. & C.

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View Answer Initiated by light

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