Chemical Engineering MCQs

Page No. 570

The preferred reacting system for oxidation of o-xylene to phthalic anhydride is _____________________?


aJacketed liquid phase CSTR


bJacketed steam heated multitubular reactor


cMultitubular reactor with cooling


dMultistage multitubular reactor with interstage cooling



The gas phase reaction 2A ⇌ B is carried out in an isothermal plug flow reactor. The feed consists of 80 mole % A and 20 mole % inerts. If the conversion of A at the reactor exit is 50%, then CA/CA0 at the outlet of the reactor is _______________________?


a2/3


b5/8


c1/3


d3/8


View Answer 5/8

Which of the following is the optimum operating condition for an exothermic reversible reaction taking place in a plug-flow reactor ?


aTemperature should be high in the beginning and decreased towards the end of the reaction


bVery low temperature should be used throughout the reaction


cVery high temperature should be used throughout the reaction


dNone of these



What is the order of a chemical reaction whose rate is deter-mined by the variation of one concentration term only ?


aZero


bFirst


cSecond


dThird


View Answer First

When a catalyst increases the rate of chemical reaction, the rate constant_____________________?


aDecreases


bIncreases


cRemain constant


dBecome infinite


View Answer Increases

A reaction which is catalysed by a base is catalysed by all substances which have a tendency to_______________________?


aLose a proton


bGain a proton


cGain an electron


dNone of these


View Answer Gain a proton

If ΔG (free energy change) for a chemical reaction is very large and negative, then the reaction is_______________________?


aNot feasible


bJust feasible


cVery much feasible


dUnpredictable as ΔG is no measure of feasibility of a reaction


View Answer Very much feasible

______________ catalytic reaction is involved in the thermal cracking of gas oil ?


aHomogeneous


bNon-Homogeneous


cHeterogeneous


dNon-Heterogeneous


View Answer Homogeneous

The residence time distribution of an ideal CSTR is _____________________?


a(1/η) exp (-t/η)


bη exp (-t/η)


cexp (-t/η)


d(1/η) (-t/η)


View Answer exp (-t/η)

Which of the following is not a unit of reaction rate ?


aMoles for med/(surface of catalyst) (time)


bMoles formed/volume of reactor) (time)


cMole formed/volume of catalyst) (time)


dNone of these


View Answer None of these

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