Chemical Engineering MCQs

Page No. 548

If in the gaseous phase reaction, N2O4 ⇌ 2NO2, x is the part of N2O4 which dissociates, then the number of molecules at equilibrium will be___________________?


a(1 + x)


b(1 – x)


c(1 + x)2


d(1 – x)2


View Answer (1 + x)

The catalyst in a second order reversible reaction increases the rate of the forward reaction___________________?


aAnd decreases that of backward reaction


bAnd backward reaction equally


cOnly


dTo a greater extent than that of the backward reaction



The rate constant of a first order reaction depends on the ________________?


aConcentration of the reactant


bTemperature


cConcentration of the product


dTime


View Answer Temperature

The units of frequency factor in Arrhenius equation_________________?


aAre the same as those of the rate constant


bDepend on the order of the reaction


cDepend on temperature, pressure etc. of the reaction


dAre cycles per unit time



Rate constant for a first order reaction does not depend upon reaction time, extent of reaction and the initial concentration of reactants; but it is a function of reaction temperature. In a chemical reaction, the time required to reduce the concentration of reactant from 100 gm moles/litre to 50 gm moles/litre is same as that required to reduce it from 2 gm moles/litre to 1 gm mole/litre in the same volume. Then the order of this reaction is ?


a0


b1


c2


d3


View Answer 1

A catalyst in a chemical reaction _______________ free energy change in the reaction?


aIncreases


bDecreases


cEither A. or B.; depends on the type of catalyst


dNeither A. nor B.



The ratio of volume of mixed reactor to the volume of P.F.R. (for identical flow rate, feed composition and conversion) for zero order reaction is________________?


a


b0


c1


d> 1


View Answer 1

The catalytic activity of enzymes is due to their capacity to lower the ______________ energy?


aActivation


bPotential


cKinetic


dNone of these


View Answer Activation

In case of _____________ reactions, the reaction rate does not decrease appreciably as the reaction proceeds?


aCatalytic


bParallel


cSeries


dAuto catalytic


View Answer Auto catalytic

Conversion increases with increase in temperature in case of a/an ______________ reaction?


aAutocatalytic


bIrreversible


cReversible endothermic


dReversible exothermic



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