Chemical Reaction Engineering - Chemical Engineering Questions and Answers

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The reactions of high molecularity are rare, because

of very large activation energy of many bodies.

of low probability of many body collisions.

many body collisions are not favoured energetically.

of requirement of very large concentration for such reactions.

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Which of the following is the most suitable for isothermal operation ?

Batch reactor

Back-mix reactor

Plug-flow reactor

Fixed bed reactor

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For a first order chemical reaction, the rate constant

changes on changing the concentration units.

is not a function of the unit of time.

has unit of time^-1.

none ofthese.

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Which of the following is an autocatalytic reaction ?

Photochemical reactions

Microbial fermentation reaction

Enzyme fermentation reaction

Ammonia synthesis reaction

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The performance of a cascade of CSTR's can be improved by adding

a P.F. reactor in series.

a P.F. reactor in parallel.

more CSTR's in series.

more CSTR's in parallel.

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A multiple reaction may be classified as a __________ reaction.

consecutive or side

parallel or side

mixed

all (a), (b) and (c)

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Holding time for flow reactors is __________ the space time, for constant fluid density

double

triple

equal to

none of these.

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Pick out the wrong statement.

In a multistep reaction, the slowest step is the rate determining step.

In general, the rate of a reaction becomes triple for every 10°C rise in temperature.

Slow chemical reactions have generally high values of activation energy.

Molecularity of a reaction can not be zero but the order of a reaction can be zero.