chemical engineering chemical reaction MCQs – Page 18

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 Review each marked answer and report any item that may be outdated or unclear.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

341. An exothermic reaction takes place in an adiabatic reactor. The product temperature ______________ reactor feed temperature?
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A. May be greater or less than

B. Is always less than

C. Is always equal to

D. Is always greater than

342. A catalyst in a chemical reaction _______________ free energy change in the reaction?
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A. Decreases

B. Either A. or B.; depends on the type of catalyst

C. Increases

D. Neither A. nor B.

343. For a heterogeneous catalytic reaction____________________?
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A. The catalyst does not form an intermediate complex with the reactant

B. A relatively small amount of catalyst can cause the conversion of large amount of reactants

C. Free energy of activation is lowered in the presence of catalyst, which remains unchanged at

D. The surface of the catalyst does not play an important role during reaction

E. ch does not mean that catalyst concentration is important

F. end of reaction</strong>

344. Pick out the correct statement?
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A. Reactions with high activation energies are very temperature sensitive

B. Chemical equilibrium is a static state

C. A photochemical reaction is catalysed by light

D. A chemical reaction occurs when the energy of the reacting molecule is less than the activation energy of the reaction

345. In a reversible chemical reaction having two reactants in equilibrium, if the concentration of the reactants are doubled, then the equilibrium constant will________________?
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A. Become one fourth

B. Remain the same

C. Also be doubled

D. Be halved

346. For a zero order chemical reaction, the__________________?
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A. Products concentration increases linearly with time

B. All A., B. and C.

C. Plot of products concentration with time is a straight line through the origin

D. Half life period is directly proportion to the initial concentration of the reactants

347. If Thiele modulus is ________________, then the pore diffusion resistance in a catalyst may be considered as negligible?
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A. ?

B. < 0.5

C. > 0.5

D. 0

348. A batch reactor is suitable for__________________?
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A. Achieving cent percent conversion of reactants into products

B. Liquid phase reactions

C. Large scale gaseous phase reactions

D. Obtaining uniform polymerisation products in highly exothermic reactions

349. The rate of a chemical reaction is almost doubled for every 10C rise in temperature. The rate will increase ______________ times, if the temperature rises from 10 to 100C?
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A. 512

B. 112

C. 612

D. 256

350. Design of heterogamous catalytic reactor involves consideration of _______________ steps?
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A. Only chemical

B. Only physical

C. Both A. & B.

D. Neither A. nor B.

351. The synthesis of proteins and metabolism in biological objects occur in the presence of biocatalyst called_________________?
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A. A ferment or an enzyme

B. Fungi

C. None of these

D. Haemoglobin

352. The molecularity and the order of reaction respectively, for the hydrolysis of methyl acetate in presence of acids are_______________?
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A. 1 & 1

B. 11 & 2

C. 2 & 1

D. 2 & 2

353. In a consecutive reaction system of the given figure bellow, when E1 is much greater than E2, the yield of B increases with the____________________?
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A. Decrease in initial concentration of A

B. Increase of temperature

C. Decrease of temperature

D. Increase in initial concentration of A

354. For high conversion in a highly exothermic solid catalysed reaction, use a ______________ bed reactor?
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A. Fixed bed reactor followed by a fluidised

B. Fluidised bed reactor followed by a fixed

C. Fixed

D. Fluidised

355. Pick out the wrong statement ?
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A. A catalyst does not alter the final position of equilibrium in a reversible reaction

B. A catalyst is specific in reaction

C. A catalyst initiates a reaction

D. A catalyst remains unchanged in chemical composition at the end the reaction

356. If the catalyst pore size is small in comparison with the mean free path, collisions with the pore wall controls the process. The diffusivity under this condition is called Knudsen diffusivity, which is affected by the_____________________?
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A. Pressure

B. Temperature

C. Both A. & B.

D. Neither A. nor B.

357. Pick out the wrong statement ?
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A. A.e-Ea/RT

B. n the rate of disappearance of CH3CHO is equal to K.CCH3I.CHI and acts as a catalyst</strong>

C. ctor should be placed in series before the larger reactor

D. Two mixed reactors of unequal size are available for producing a specified product, formed by

E. The mechanism for the decomposition of CH3CHO into CH4 and CO in presence of I2 is:

F. Arrhenius equation describing the effect of temperature on rate constant is given by,

358. The increase in the rate of reaction with temperature is due to__________________?
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A. Decrease in activation energy

B. Increase in the number of effective collisions

C. None of these

D. Increase in the average kinetic energy of the reacting molecules

359. Enzymes are destroyed, when the_______________?
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A. Reactants concentration is very high

B. Reaction rate is independent of the reactants concentration

C. Reactants concentration is very low

D. Temperature is very high

360. A space time of 3 hours for a flow reactor means that___________________?
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A. It takes three hours to dump the entire volume of the reactor with feed

B. Three reactor volumes of feed can be processed every hour

C. The time required to process one reactor volume of feed (measured at specified conditions) is

D. ours</strong>

E. Conversion is cent per cent after three hours

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