CHEMICAL REACTION ENGINEERING QUIZ

The importance of diffusion in a catalyst are increased by

Large catalyst particle size

An active surface of the catalyst

Small pore diameter

All of these

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For identical flow rate and feed composition, X plug flow reactors (PER) in series with a total volume V gives the same conversion as single

CSTR of volume V/X

CSTR of volume V

PFR of volume V/X

PFR of volume V

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Recycling back of outlet stream to the reactor from an ideal CSTR carrying out a first order liquid phase reaction will result in __________ in conversion.

Increase

Decrease

Either A or B, depends on the type of reaction

No change

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The conversion of a reactant, undergoing a first order reaction, at a time equal to three times the half life of the reaction is

0.425

0.5

0.875

Data insufficient to calculate

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Higher free energy of activation of a chemical reaction (at a given temperature) implies

Both B and C

Higher rate of reaction

Slower rate of reaction

Higher equilibrium conversion

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Brunaur, Emmet and Teller (BET) equation is used to determine the specific surface area of a porous particle but not the pore volume & the porosity of the catalyst bed. Which of the following postulates is not used to derive BET equation?

There is no dynamic equilibrium between successive layer

Langmuir

None of these

The adsorbed layer may be polymolecular in thickness and the heat of adsorption in each layer (except the first one) is involved in each of the evaporation process

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The half life period of a first order reaction is

Dependent on initial concentration of the reactants

Always the same irrespective of the reaction

Proportional to the initial concentration of reactants

Half the specific rate constant

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

Unpredictable as ΔG is no measure of feasibility of a reaction

Very much feasible

Just feasible

Not feasible

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In case of a __________ reactor, the composition in the reactor and at the exit of the reactor is the same.

Back-mix

Tubular

Semi-batch

Batch

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The order of a chemical reaction is

An experimentally determined quantity

Always equal to the total stoichiometric number of reactants

None of these

Never fractional

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