Chemical Engineering MCQs

Page No. 555

In solid catalysed reactions the diffusional effects are more likely to affect the overall rate of reaction for________________?


aFast reactions in catalyst of small pore diameter


bFast reaction in catalyst of large pore diameter


cSlow reactions in catalyst of small pore diameter


dSlow reactions in catalyst of large pore diameter



Half-life period for a first order reaction is _____________ the initial concentration of the reactant?


aDirectly proportional to


bInversely proportional to


cIndependent of


dNone of these


View Answer Independent of

Recycling back of outlet stream to the reactor from an ideal CSTR carrying out a first order liquid phase reaction will result in ______________ in conversion?


aDecrease


bIncrease


cNo change


dEither A. or B., depends on the type of reaction


View Answer No change

In case of a _____________ reactor, the composition in the reactor and at the exit of the reactor is the same ?


aSemi-batch


bTubular


cBatch


dBack-mix


View Answer Back-mix

Catalytic action in a catalytic chemical reaction follows from the ability of catalyst to change the ___________________?


aActivation energy


bEquilibrium constant


cHeat of reaction


dNone of these


View Answer Activation energy

Reaction of benzene with chlorine gas to produce tri-chlorobenzene exemplifies a/an ______________ reaction?


aElementary


bParallel


cConsecutive


dNone of these


View Answer Consecutive

The eddy diffusivity for a liquid in plug flow must be_________________?


a1


b0


c


dBetween 0 and 1


View Answer 0

In which of the following gaseous phase reversible reactions, the product yield cannot be increased by the application of high pressure ?


aN2 + O2 ⇌ 2NO


bPCl3 + Cl2 ⇌ PCl5


cN + 3H2 ⇌ 2NH3


d2SO2 + O2 ⇌ 2SO3


View Answer N2 + O2 ⇌ 2NO

In a/an _____________ vessel, the fluid enters and leaves following plug flow?


aOpen


bClosed


cOpen-closed


dClose-opened


View Answer Closed

If the pore diffusion controls in a catalytic reaction, the apparent activation energy Ea is equal to___________________?


aThe intrinsic activation energy E


b(E + ED) where ED is activation due to diffusion


c(E + ED)/2


dED/2


View Answer ED/2

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