chemical engineering chemical reaction MCQs – Page 20

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 Review each marked answer and report any item that may be outdated or unclear.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
381. If n = overall order of a chemical reaction. a = initial concentration of reactant. t = time required to complete a definite fraction of the reaction. Then pick out the correct relationship ?
comments icon0

A. t ? 1/an + 1

B. t ? 1/an 1

C. t ? an

D. t ? 1/an

382. The dimensions of rate constant for reaction 3A ? B are (l/gm mole)/min. Therefore the reaction order is______________________?
comments icon0

A. 3

B. 2

C. 1

D. 0

383. An imbalanced chemical reaction equation is against the law of________________?
comments icon0

A. Multiple proportion

B. Constant proportion

C. None of these

D. Conservation of mass
384. In a/an _____________ vessel, the fluid enters and leaves following plug flow?
comments icon0

A. Open

B. Open-closed

C. Closed

D. Close-opened

385. For a gaseous phase reaction, rate of reaction is equal to K. CA . CB. If the volume of the reactor is suddenly reduced to 1/4th of its initial volume, then the rate of reaction compared to the original rate will be ______________ times?
comments icon0
A. 16

B. 8-Jan

C. 16-Jan

D. 8

386. A first order reaction requires two unequal sized CSTR. Which of the following gives higher yield ?
comments icon0
A. Either of the arrangement A. or B. will give the same yield

B. Data insufficient, cant be predicted

C. Large reactor followed by smaller one

D. Smaller reactor followed by larger one

387. Pick out the wrong statement ?
comments icon0

A. a particular duty

B. ocatalytic reaction

C. ctor provides higher overall selectivity</strong>

D. For an ideal mixed reactor at steady state, the exit stream has the same composition as fluid

E. For a first order consecutive reaction, a tubular flow reactor as compared to a stirred tank

F. Plug flow reactor (PFR) is always smaller than mixed reactor for all positive reaction orders

388. The fractional volume change of the system for the isothermal gas phase reaction, A ? 3B, between no conversion and complete conversion is___________________?
comments icon0

A. 0.5

B. 3

C. 2

D. 1

389. The single parameter model proposed for describing non-ideal flow is the ____________ model?
comments icon0

A. Tank in series

B. Dispersion

C. Both A. & B.

D. Neither A. nor B.

390. In case of _____________ reactions, the reaction rate does not decrease appreciably as the reaction proceeds?
comments icon0

A. Catalytic

B. Parallel

C. Auto catalytic

D. Series

391. Pick out the wrong statement ?
comments icon0

A. Autocatalytic reactions are exemplified by microbial fermentation reactions

B. The slowest step has the greatest influence on the overall reaction rate in case of an

C. eversible series reaction

D. The fractional conversion at any time is same for both the constant as well as the variable

E. ume system in case of an irreversible unimolecular type first order reaction

F. Hydrolysis of ester in presence of alkali or acid is a zero order reaction
392. Pick out the wrong statement?
comments icon0

A. Most of the enzyme catalysed reactions involve at least two substrates

B. Equilibrium concentrations in enzyme catalysed reactions can be calculated by using the

C. rmodynamic properties of substrates & products

D. mical agents, is maximum at a temperature of about 45C

E. Enzymes help in increasing the activation energy of the reaction

F. Catalytic activity of enzyme catalysed reactions which is affected by temperature, pH value &

393. When the reaction is dominated by intraparticle diffusion, the apparent order of reaction (nD) as measured is related to the true order (n) as ________________?
comments icon0
A. nD = (n + 1)/2

B. nD = n + 1

C. nD = n/2

D. None of these

394. With decrease in temperature, the equilibrium conversion of a reversible endothermic reaction_________________?
comments icon0
A. Decreases

B. Increases

C. Remain unaffected

D. Increases linearly with temperature

395. Which of the following is an independent variable for a batch tank reactor with uniform concentration and temperature ?
comments icon0

A. None of these

B. Diameter of the reactor

C. Useful volume of the tank

D. Time
396. The response curve for a step input signal from a reactor is called C-curve. The variance of C-curve in a tanks in series model comprising of m tanks is equal to ___________________?
comments icon0

A. m2

B. ?m

C. 1/m

D. m

397. Velocity of a reaction depends upon the_________________?
comments icon0

A. Temperature at which the reaction is carried

B. All A., B. and C.

C. Concentration of the reactants

D. Nature of the reactants

398. . In the converter of the contact process for the manufacture of H2SO4 the equilibrium conversion of SO2__________ (i) __________ with increase in temperature and __________ (ii) __________ with increase in the mole ratio of SO2 to air?
comments icon0
A. (i) decreases (ii) increases

B. (i) increases (ii) increases

C. (i) increases (ii) decreases

D. (i) decreases (ii) decreases

399. In case of a/an ______________ chemical reaction, conversion increases with the rise in temperature?
comments icon0

A. Irreversible exothermic

B. Irreversible endothermic

C. Reversible exothermic

D. Reversible endothermic
400. In solid catalysed reactions the diffusional effects are more likely to affect the overall rate of reaction for________________?
comments icon0

A. Fast reactions in catalyst of small pore diameter

B. Slow reactions in catalyst of large pore diameter

C. Slow reactions in catalyst of small pore diameter

D. Fast reaction in catalyst of large pore diameter