Chemical Engineering MCQs

Page No. 540

There is no correspondence between stoichiometric and the rate equation in case of a/an _____________ reaction?


aElementary


bMultiple


cAutocatalytic


dNon-elementary


View Answer Non-elementary

Specific rate constant for a second order reaction__________________?


aIs independent of temperature


bVaries with temperature


cDepends on the nature of the reactants


dBoth B. and C.


View Answer Both B. and C.

A spherical porous catalyst particle of radius R is subjected to reactant A which reacts to form B by a zero order surface reaction A → B. Film mass transfer resistance is negligible and pore diffusion of A is rate controlling. The effectiveness factor of the catalyst is reported as 7/8. Which of the following statement is true?


aInner catalyst core of radius R/8 does not participate in reaction


bInner catalyst core of radius R/2 does not participate in reaction


cInner catalyst core of radius 7R/8 does not participate in reaction


dEffectiveness factor for a zero order reaction cannot be 7/8 as it must always be 1



If the time required to complete a definite fraction of reaction varies inversely as the concentration of the reactants, then the order of reaction is________________?


a1


b2


c3


d4


View Answer 2

Velocity of a reaction depends upon the_________________?


aNature of the reactants


bConcentration of the reactants


cTemperature at which the reaction is carried


dAll A., B. and C.


View Answer All A., B. and C.

From among the following, choose one which is not an exothermic process ?


aMethanol synthesis


bCatalytic cracking


cAmmonia synthesis


dOxidation of sulphur


View Answer Catalytic cracking

A batch adiabatic reactor at an initial temperature of 373°K is being used for the reaction, A → B. Assume the heat of reaction is – 1kJ/mole at 373°K and heat capacity of both A and B to be constant and equal to 50J/mole.K. The temperature rise after a conversion of 0.5 will be ____________?


a5°C


b10°C


c20°C


d100°C


View Answer 10°C

The most unsuitable reactor for carrying out reactions in which high reactant concentration favours high yields is________________________?


aBackmix reactor


bPlug flow reactor


cSeries of CSTR


dPFR in series


View Answer Backmix reactor

Pure ethanol vapor is fed to a reactor packed with alumina catalyst, at the rate of 100 kmole / hr. The reactor products comprise: ethylene: 95 kmole / hr, water vapour: 97.5 k mole / hr and diethyl ether: 2.5 kmole/hr. The reactions occuring can be represented by: C2H5OH → C2H4 + H2O 2C2H5OH → C2H5 – O – C2H5 + H2O The percent conversion of ethanol in the reactor is________________?


a100


b97.5


c95


d2.5


View Answer 100

‘If the catalyst pore size is small in comparison with the mean free path, collisions with the pore wall controls the process’. The diffusivity under this condition is called ‘Knudsen diffusivity’, which is affected by the_____________________?


aPressure


bTemperature


cBoth A. & B.


dNeither A. nor B.


View Answer Temperature

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