chemical engineering chemical reaction MCQs – Page 24

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 Review each marked answer and report any item that may be outdated or unclear.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
461. The temperature dependence of reaction rate constant (K) by Arrhenius law is given by_______________?
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A. K ? eE/RT

B. K ? e-E/RT

C. K ? T . e-E/RT

D. K ? ?T . e-E/RT

462. Pick out the wrong statement pertaining to space velocity of flow reactors?
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A. None of these

B. The space velocity of 3 hr-1 means that three reactor volumes of feed at specified conditions

C. being fed into the reactor every hour

D. The space velocity of 3 hr-1 means that one third reactor volume of feed at specified

E. ditions are being fed into the reactor</strong>

F. The unit of space velocity is (time)-1

463. At a given value of E/R (ratio of activation energy and gas constant), the ratio of the rate constants at 500K and 400K is 2, if Arrhenius law is used. What will be this ratio, if transition state theory is used with the same value of E/R? ?
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A. 2.5

B. 2

C. 1.6

D. 2.24

464. If CA is the quantity of reactants initially present, the quantity left after n half periods will be equal to__________________?
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A. (CA/2)1/n

B. (CA)1/2n

C. ()n CA

D. (CA/2)n

465. Pick out the wrong statement?
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A. Exit age description function E. and internal age distribution function (I) are related as, E = -(dI/d?)

B. A higher temperature favours the reaction of higher activation energy

C. Chemisorption studies are useful in the determination of catalyst surface area and pore size distribution

D. A catalyst increases the potential energy barrier over which the reactants must pass to form products
466. A trickle bed reactor is the one, which_________________?
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A. Employs all the three phases (i.e. solid, liquid and gas)

B. Has altogether three streams either entering or leaving

C. Processes three reactants at different flow rates

D. Processes three reactants with same flow rate

467. An isothermal irreversible reaction is being carried out in an ideal tubular flow reactor. The conversion in this case will ______________ with decrease in space time?
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A. Increase

B. Increase exponentially

C. Decrease

D. Remain unchanged

468. The decomposition of A into B is represented by the exothermic reaction, A ? 2B. To achieve maximum decomposition, it is desirable to carry out the reaction ?
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A. At high P and high T

B. At low P and low T

C. At low P and high T

D. At high P and low T

469. The unit of frequency factor in Arrhenius equation is_______________?
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A. Same as that of activation energy

B. Dimensionless

C. Same as that of rate constant

D. None of these

470. Which of the following factors control the deactivation of a porous catalyst pellet?
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A. All A., B. and C.

B. Decay reactions

C. Pore diffusion

D. Form of surface attack by poison

471. A reaction in which one of the products of reaction acts as a catalyst is called a/an ______________ reaction?
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A. None of these

B. Catalytic

C. Photochemical

D. Autocatalytic
472. 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?
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A. No change

B. Increase

C. Either A. or B., depends on the type of reaction

D. Decrease