Chemical Engineering MCQs

Page No. 571

Rate of a chemical reaction is independent of the concentration of the reactants for a _________________ reaction?


aZero order


bThird order


cConsecutive


dNone of these


View Answer Zero order

A batch reactor suffers from following disadvantage ?


aPoor product quality control


bHigh labour and handling cost


cHigh shutdown time requirement for emptying, cleaning and refilling


dAll A., B. and C.


View Answer All A., B. and C.

A catalyst inhibitor____________________?


aLessens its selectivity


bMay be useful for suppressing undesirable side reactions


cIs added in small quantity during the catalyst manufacture itself


dAll A., B. and C.


View Answer All A., B. and C.

Calcination reaction of limestone (CaCO3 → CaO + CO2) goes to completion in the rotary kiln, because____________________?


aCaO is not dissociated


bCO2 escapes continuously


cOf high calcination temperature


dCaO is more stable than CaCO3



Which of the following curves shows the effect of temperature on the extent of gas-solid adsorption at a given pressure ?


aLangmuir adsorption isotherm


bAdsorption isobar


cFreundlich adsorption isotherm


dNone of these


View Answer Adsorption isobar

Promoter is added to the catalyst to improve its____________________?


aPorosity


bSensitivity


cSurface area


dNone of these


View Answer Sensitivity

A batch reactor is characterised by ____________________?


aConstant residence time


bVariation in extent of reaction and properties of the reaction mixture with time


cVariation in reactor volume


dVery low conversion



Concentration of the limiting reactant (with initial concentration of a moles/litre) after time t is (a-x). Then ‘t’ for a first order reaction is given by____________________?


ak. t = ln a/(a – x)


bk. t = x/a (a – x)


ck. t = ln (a – x)/a


dk. t = ln a (a – x)/x


View Answer k. t = ln a/(a – x)

What is the maximum possible value of FR(mole/sec.) ?


a1/3


b1/2


c2/3


d2


View Answer 2/3

A second order reaction of the form A + B → C is called a pseudo-first order reaction, when____________________?


aCA0 = CB0


bCA0 > CB0


cCB0 > CA0


dCB0 ≥ CB0


View Answer CB0 ≥ CB0

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