chemical engineering chemical reaction MCQs – Page 22

Practise multiple-choice questions from chemical engineering chemical reaction for competitive examinations and subject revision. Review each marked answer and report any item that may be outdated or unclear.

chemical engineering chemical reaction Mcqs

421. The experimentally determined overall order of the reaction, A + B ? C + D, is two. Then the__________________?
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A. Reaction is elementary but the molecularity may not be 2

B. Reaction is elementary with a molecularity of 2

C. Molecularity of the reaction is 2, but the reaction may not be elementary

D. Reaction may be elementary with molecularity of 2

422. Pick out the correct statement ?
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A. A catalyst speeds up the forward reaction but slows shown the reverse reaction

B. The composition of equilibrium is changed by catalyst

C. Pressure changes do not change the equilibrium concentrations

D. Addition of catalyst changes the equilibrium constant

423. For a first order chemical reaction, the rate constant_________________?
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A. Has unit of time-1

B. Changes on changing the concentration units

C. None of these

D. Is not a function of the unit of time

424. When a catalyst increases the rate of forward reaction, the value of rate constant__________________?
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A. Remain same

B. Decreases

C. Becomes infinite

D. Increases

425. In a semi-batch reactor __________________?
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A. Velocity of reaction can be controlled

B. Mixing takes place in axial direction only

C. Condition similar to plug flow reactor exists

D. Residence time is constant

426. What is the dispersion number for a plug flow reactor ?
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A. ?

B. -1

C. 1

D. 0

427. A reactor is generally termed as an autoclave, when it is a_____________________?
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A. High pressure batch reactor

B. Atmospheric pressure CSTR

C. Atmospheric pressure tank reactor

D. High pressure tubular reactor

428. Rate constant k and absolute temperature T are related by collision theory (for bimolecular) as______________________?
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A. k ? T1.5

B. k ? exp(-E/RT)

C. k ? ?T

D. k ? T

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

B. Non-elementary

C. Multiple

D. Elementary

430. In a chemical reaction, _____________________ are conserved?
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A. Ions

B. Masses

C. Atoms

D. Both B. & C.

431. The following half life data are available for the irreversible liquid phase reaction A ? products. The overall order of reaction is __________________?
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A. 2

B. 0.5

C. 1.5

D. 1

432. The ratio of volume of mixed reactor to the volume of P.F.R. (for identical flow rate, feed composition and conversion) for zero order reaction is________________?
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A. ?

B. > 1

C. 0

D. 1

433. A catalyst is said to be a negative catalyst, if it ___________________?
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A. Reduces the value of equilibrium constant

B. Does not initiate the reaction

C. All A., B. and C.

D. Retards the rate of reaction

434. A catalyst______________________?
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A. Lowers the activation energy of reacting molecules

B. Is capable of reacting with any one of the reactants

C. Initiates a reaction

D. Cannot be recovered chemically unchanged at the end of a chemical reaction

435. A reversible liquid phase endothermic reaction is to be carried out in a plug flow reactor. For minimum reactor volume, it should be operated such that the temperature along the length ?
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A. Increases

B. Is at the highest allowable temperature throughout

C. First increases and then decreases

D. Decreases

436. The conversion in a mixed reactor/accomplishing a reaction A ? 3R is 50% when gaseous reactant A is introduced at the rate of 1 litre/second and the leaving flow rate is 2 litres/second. The holding time for this operation is _______________ second?
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A. 3

B. 1

C. 2

D. 0.5

437. Rate determining step in a reaction consisting of a number of steps in series is the ______________ step?
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A. Fastest

B. Slowest

C. Intermediate

D. Data insufficient; cant be predicted

438. In case of physical adsorption, the heat of adsorption is of the order of _____________ kcal/kg mole?
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A. 1000

B. 10000

C. 100

D. 100000

439. A balanced chemical reaction equation conforms to the law of________________?
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A. None of these

B. Avogadros hypothesis

C. Gaseous volumes

D. Conservation of mass

440. Which of the following is an autocatalytic reaction ?
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A. Ammonia synthesis reaction

B. Photochemical reactions

C. Enzyme fermentation reaction

D. Microbial fermentation reaction

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