Chemical Engineering MCQs

Page No. 571

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


aZero order

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bThird order

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cConsecutive

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dNone of these

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View Answer Zero order

A batch reactor suffers from following disadvantage ?


aPoor product quality control

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bHigh labour and handling cost

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cHigh shutdown time requirement for emptying, cleaning and refilling

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dAll A., B. and C.

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View Answer All A., B. and C.

A catalyst inhibitor____________________?


aLessens its selectivity

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bMay be useful for suppressing undesirable side reactions

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cIs added in small quantity during the catalyst manufacture itself

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dAll A., B. and C.

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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

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bCO2 escapes continuously

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cOf high calcination temperature

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dCaO is more stable than CaCO3

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


aLangmuir adsorption isotherm

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bAdsorption isobar

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cFreundlich adsorption isotherm

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dNone of these

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View Answer Adsorption isobar

Promoter is added to the catalyst to improve its____________________?


aPorosity

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bSensitivity

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cSurface area

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dNone of these

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View Answer Sensitivity

A batch reactor is characterised by ____________________?


aConstant residence time

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

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cVariation in reactor volume

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dVery low conversion

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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)

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bk. t = x/a (a – x)

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ck. t = ln (a – x)/a

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dk. t = ln a (a – x)/x

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View Answer k. t = ln a/(a – x)

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


a1/3

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b1/2

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c2/3

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d2

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View Answer 2/3

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


aCA0 = CB0

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bCA0 > CB0

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cCB0 > CA0

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dCB0 ≥ CB0

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View Answer CB0 ≥ CB0

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