chemical engineering chemical reaction MCQs – Page 21

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 Review each marked answer and report any item that may be outdated or unclear.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

401. Molecularity of a reaction__________________?
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A. Is always equal to the overall order of reaction

B. May not be equal to the order of reaction

C. Cant have a fractional value

D. Both B. and C.

402. Pick out the correct statement?
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A. A catalyst initiates a chemical reaction

B. A catalyst cannot be recovered chemically unchanged at the end of the chemical reaction

C. In catalytic reactions, the catalyst reacts with the reactants

D. A catalyst lowers the activation energy of the reacting molecules

403. If helium is introduced in a reactor containing O2, SO2 and SO3 at equilibrium, so that total pressure increases while volume and temperature remains constant. In this case the dissociation of SO3 (as per Le Chateliers principle)?
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A. Increases

B. Remains unaltered

C. Decreases

D. Changes unpredictably

404. Which of the following chemical reactions will be favoured by low pressure ?
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A. N2O2 ? 2NO2

B. None of these

C. 2HI ? H2 + I2

D. N2 + O2 ? 2NO

405. An endothermic aqueous phase first order irreversible reaction is carried out in an adiabatic plug flow reactor. The rate of reaction ?
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A. Goes through a maximum along the length of the reactor

B. Is maximum at the inlet of the reactor

C. Goes through a minimum along the length of the reactor

D. Is maximum at the exit of the reactor

406. According to Arrhenius equation of temperature dependency of rate constant for an elementary reaction _________________?
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A. None of these

B. k ? T e-E/RT

C. k ? ?T

D. k ? e-E/RT

407. In the gaseous phase ammonia formation reaction (N2 + 3H2 ? 2NH3), the value of the equilibrium constant depends on the_________________?
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A. Volume of the reactor

B. Temperature

C. Total pressure of the system

D. Initial concentration of N2 and H2

408. From among the following, choose one which is not an exothermic process ?
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A. Methanol synthesis

B. Catalytic cracking

C. Ammonia synthesis

D. Oxidation of sulphur

409. During manufacture of H2SO4, the oxidation of SO2 to SO3 by oxygen is an endothermic reaction. The yield of SO3 will be maximised, if the _____________________?
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A. Temperature is increased and pressure is reduced

B. Pressure is reduced

C. Temperature is reduced and pressure is increased

D. Temperature is increased

410. Pick out the wrong statement?
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A. The ratio of volumes of plug flow reactor to that of mixed reactor is always less than one for identical feed composition, flow rate, conversion and for all positive reaction orders

B. The differential method of analysing kinetic data requires more accurate or larger amounts of data

C. When the reaction rate is independent of temperature, the reaction is said to be of zero order

D. The integral method of analysing kinetic data is used when the data is scattered

411. The ratio of moles of a reactant converted into the desired product to that converted into unwanted product is called_________________?
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A. Operational yield

B. Relative yield

C. None of these

D. Selectivity

412. If the pore diffusion controls in a catalytic reaction, the apparent activation energy Ea is equal to___________________?
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A. (E + ED)/2

B. (E + ED) where ED is activation due to diffusion

C. The intrinsic activation energy E