chemical engineering chemical reaction MCQs – Page 12

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 Review each marked answer and report any item that may be outdated or unclear.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
221. A reaction which is catalysed by a base is catalysed by all substances which have a tendency to_______________________?
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A. Lose a proton

B. Gain a proton

C. None of these

D. Gain an electron

222. Half life period of decomposition of a liquid A by irreversible first order reaction is 12 minutes. The time required for 75% conversion of A is _____________ minutes?
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A. 6

B. 24

C. 12

D. 18

223. The exit age distribution of fluid leaving a vessel is used to know the__________________?
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A. Extent of non-ideal flow in the vessel

B. None of these

C. Reaction mechanism

D. Activation energies of a reaction

224. In a continuous flow stirred tank reactor, the composition of the exit stream_________________?
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A. Depends upon the flow rate of inlet stream

B. Is same as that in the reactor

C. None of these

D. Is different than that in the reactor

225. For an ideal mixed flow reactor (CSTR), the exit age distribution E(t) is given by __________________?
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A. None of the above

B. A step function

C. A ramp function

D. A Dirac delta function

226. For the same residence time, which one will give the maximum conversion ?
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A. Single tubular flow reactor (v = 5 litres)

B. Stirred tank followed by tubular flow reactor (each of 2.5 litres)

C. Single stirred tank (v = 5 litres)

D. Two stirred tank (each of 2.5 litres) in series

227. For the reaction, A + B ? 2B + C,___________________?
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A. rA = -rB

B. rA = rB/2

C. rA = rB

D. rA = 2rB

228. A first order gaseous phase reaction is catalysed by a non-porous solid. The kinetic rate constant and the external mass transfer co-efficients are k and kg respectively. The effective rate constant (keff) is given by________________?
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A. keff = (k+ kg)/2

B. keff = k + kg

C. 1/keff = 1/k + 1/kg

D. keff = (kkg)1/2

229. The concentration of A in a first order reaction, A ? B, decreases_____________________?
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A. Very abruptly towards the end of the reaction

B. Linearly with time

C. Exponentially with time

D. Logarithmically with time

230. The vessel dispersion number (D/?L) for plug flow is_________________?
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A. ?

B. 0

C. 500

D. 750

231. Which of the following is the most suitable for very high pressure gas phase reaction ?
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A. Tubular flow reactor

B. Fluidised bed reactor

C. Batch reactor

D. Stirred tank reactor

232. Helium-mercury method can be used to determine the _____________ of the catalyst particle?
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A. Solid density

B. All A., B., & C.

C. Porosity

D. Pore volume

233. Reaction rate of a first order reaction, which is half completed in 23 minutes will be _________________?
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A. 0.05 min-1

B. 0.03 hr-1

C. 0.03 min-1

D. 0.03 sec-1

234. When a high liquid hold up is required in a reactor for gas liquid reaction, use ______________ column?
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A. Tray

B. Packed

C. Bubble

D. Spray

235. Semibatch reactor is preferred, when a/an__________________?
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A. A gas is to be reacted with liquid (e.g. hydrogenation of fat)

B. Undesirable side reaction (at high concentration of one of the reactants) is to be avoided

C. All A., B., and C.

D. A highly exothermic reaction is to be controlled

236. Participation of _______________ is involved in the occurrence of a chemical reaction?
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A. Protons

B. Electrons

C. None of these

D. Neutrons

237. As the chemical reaction proceeds, the rate of reaction ___________________?
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A. Decreases

B. Increases

C. Remain same

D. May increase or decrease depending on the type of reaction

238. Equilibrium of a chemical reaction as viewed by kinetics is a ______________ state?
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A. None of these

B. Static steady

C. Dynamic steady

D. Dynamic unsteady

239. The value of Steric factor P in the equation k = PZeE/RT usually ranges from ______________________?
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A. 1.1 to 102

B. 1.0 to 10-8

C. None of these

D. 0.1 to 0.9

240. Shift conversion reaction_________________?
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A. Is non-catalytic

B. Converts CO to CO2 with steam

C. Converts N2 and H2 into NH3

D. Is highly exothermic