chemical engineering chemical reaction MCQs – Page 17

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 Review each marked answer and report any item that may be outdated or unclear.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

321. For a solid catalysed chemical reaction, the effectiveness of solid catalyst depends upon the ______________ adsorption?
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A. Physical

B. Chemical

C. Both A. and B.

D. Neither A. nor B.

322. In a reaction, the threshold energy is equal to (where, A = activation energy N = normal energy of reactants) ?
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A. A N

B. N

C. A + N

D. A

323. A high space velocity means that a given__________________?
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A. Reaction can be accomplished with small reactor

B. Conversion can be obtained with a high feed rate

C. Both A. and B.

D. None of these

324. For a first order reaction carried out in a plug flow reactor, the space time is__________________?
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A. (1/k) ln C0/C

B. (1/k) ln C/C0

C. k ln C/C0

D. k ln C0/C

325. Reverse reaction in a chemical equilibrium is favoured by the________________?
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A. Increase in the concentration of one of the reactants

B. None of these

C. Removal of one of the products regularly

D. Increase in the concentration of one of the products

326. Sometimes, batch process is preferred over continuous process, when the product___________________?
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A. Quality & yield cannot be achieved in continuous processes, because of long residence time

B. Sales demand is fluctuating

C. Both A. & B.

D. Neither A. nor B.

327. Reaction of benzene with chlorine gas to produce tri-chlorobenzene exemplifies a/an ______________ reaction?
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A. Consecutive

B. Elementary

C. Parallel

D. None of these

328. Pick out the wrong statement?
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A. Non-ideal flow takes place in reactors due to recycling, channeling or by creation of stagnant

B. The intercept of the Arrhenius plot is called the activation energy

C. A very high value of equilibrium constant, K (K >> 1) indicates that the reaction is practically

D. A particular chemical reaction is more temperature sensitive at low temperatures

E. eversible in nature

F. ions

329. For an autocatalytic reactor, the suitable reactor set up is__________________?
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A. P.F. reactors in series

B. CSTR in series

C. P.F. reactor followed by CSTR

D. CSTR followed by P.F. reactor

330. A spherical porous catalyst particle of radius R is subjected to reactant A which reacts to form B by a zero order surface reaction A ? B. Film mass transfer resistance is negligible and pore diffusion of A is rate controlling. The effectiveness factor of the catalyst is reported as 7/8. Which of the following statement is true?
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A. Inner catalyst core of radius R/2 does not participate in reaction

B. Effectiveness factor for a zero order reaction cannot be 7/8 as it must always be 1

C. Inner catalyst core of radius R/8 does not participate in reaction

D. Inner catalyst core of radius 7R/8 does not participate in reaction

331. For an ideal plug flow reactor, the value of Peclet number is_______________?
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A. 10

B. 0

C. ?

D. 1

332. Reactions with high activation energy are_____________________?
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A. Very temperature sensitive

B. Always reversible

C. Always irreversible

D. Temperature insensitive

333. Backmixing is most predominant in___________________?
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A. CSTRs connected in series

B. A single CSTR

C. A well stirred batch reactor

D. A plug-flow reactor

334. Effective diffusivity (DE) in a catalyst pellet is related to molecular diffusivity (DN) and Knudsen diffusivity (DK) as_________________?
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A. DE = DM + DK

B. 1/DE = 1/DN + DK

C. DE = DN/DE

D. DE = DM . DE

335. Pick out the wrong statement ?
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A. Molecularity of a reaction cannot be zero but the order of a reaction can be zero

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

C. Slow chemical reactions have generally high values of activation energy

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

336. Catalyst carriers___________________?
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A. Provide large surface area with a small amount of active material

B. Have very high selectivity

C. Increase the activity of a catalyst

D. Inhibit catalyst poisoning

337. The irreversible reaction is a special case of reversible reaction, if the________________?
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A. Conversion of the reactant at equilibrium condition is zero

B. Reactant concentration at equilibrium condition is zero

C. All A., B. and C.

D. Equilibrium constant is 1

338. The knowledge of initial concentration and rate constant is necessary to determine the half life time of a reaction of _______________ order?
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A. First

B. Zero

C. Second

D. None of these

339. In an exothermic chemical reaction, the reactants compared to the products have__________________?
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A. Higher temperature

B. More energy

C. Less energy

D. Same energy

340. When all the limiting reactant is consumed in the reaction, the operational yield _______________ the relative yield?
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A. Equals

B. Can be either greater or smaller than (depends on the type of reaction)

C. Is smaller than

D. Is greater than

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