chemical engineering chemical reaction MCQs – Page 15

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 Review each marked answer and report any item that may be outdated or unclear.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

281. The equilibrium constant for the reversible reaction as shown in the bellow figure, is affected by the__________________?
0

A. Presence or absence of inerts

B. Temperature of the system

C. Pressure of the system

D. Kinetics of the reaction

282. The rate at which a chemical substance reacts is proportional to its _____________________?
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A. Equivalent weight

B. Molecular weight

C. Atomic weight

D. Active mass

283. Catalytic action in a catalytic chemical reaction follows from the ability of catalyst to change the ___________________?
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A. Activation energy

B. None of these

C. Equilibrium constant

D. Heat of reaction

284. Pick out the wrong statement?
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A. mentary

B. concentration of A decreases and the rate is proportional to the concentration of A

C. In a first order reaction, A ? products; the reaction becomes slower as it proceeds, because

D. Transition state theory approaches the problem of calculating reaction rates by concentrating

E. e of an eddy to the solute decreases</strong>

F. the idea of activated complexes

285. Which one is the rate controlling step in a solid-gas non-catalytic reaction occurring at very high temperature ?
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A. Pore diffusion

B. Film diffusion

C. Ash layer diffusion

D. Chemical reaction

286. Photochemical reaction rate does not depend significantly on temperature, because____________________?
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A. It is a reversible reaction

B. It is an exothermic reaction

C. The energy of reacting molecules exceeds the activation energy by absorption of light

D. None of these

287. ______________ explains the mechanism of catalysis?
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A. None of these

B. Collision theory

C. Thermodynamics

D. Activated complex theory

288. Pick out the wrong statement?
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A. Activation energy for a reaction is obtained from the intercept of the Arrhenius plot

B. Alumina is added as a promoter to iron catalyst in ammonia synthesis reaction

C. Presence of inerts affects the equilibrium conversion of

D. Use of different catalysts in a reversible catalytic chemical reaction does not change the

E. ilibrium composition

289. If the time required to complete a definite fraction of reaction varies inversely as the concentration of the reactants, then the order of reaction is________________?
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A. 1

B. 4

C. 3

D. 2

290. Pick out the wrong statement ?
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A. A batch reactor cannot be used to study the kinetics of catalytic reaction

B. For studying a chemical reaction, it is desirable to monitor the reactants during initial stages

C. Study of non-ideal flow reactor is done experimentally by stimulus-response technique

D. Hold back is defined as the fraction of material that stays longer than the mean residence time

E. the products during the final stages of reaction

291. For a mixed flow reactor operating at steady state, the rate of reaction is given by______________?
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A. (FA0/V) (dCA/dt)

B. #NAME?

C. (FA0/V) + (dCA/dt)

D. (FA0/V) XA

292. Consider the n th order irreversible liquid phase reaction A ? B. Which one of the following plots involving half life of the reaction (t1/2) and the initial reactant concentration (CA0) gives a straight line plot ?
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A. CA0 Vs ln t1/2

B. ln CA0 Vs t1/2

C. CA0 Vs t1/2

D. ln CA0 Vs ln t1/2

293. With increase in K2/K1 in case of a unimolecular type elementary reactions as shown in the bellow figure, the fractional yield of R in mixed reactor (for a given conversion of A) ?
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A. Increases

B. Increases linearly

C. Decreases

D. Remain same

294. Pick out the wrong statement ?
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A. For a second order reaction, the slope of the graph/plot between rate and (concentration) is

B. Visible radiation provides the necessary activation energy in photochemical reactions

C. Molecularity of the reaction is always a whole number greater than zero

D. The order and molecularity of a complex reaction may not be the same

E. al to the rate constant (k)

295. Holding time for flow reactors is _______________ the space time, for constant fluid density ?
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A. Triple

B. Equal to

C. None of these

D. Double

296. For a vapour phase catalytic reaction (A + B ? P) which follows the Ridel mechanism and the reaction step is rate controlling, the rate of reaction is given by (reaction rate is irreversible, product also absorbs) ?
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A. -rA = (k . PA . PB)/(1 + KAPA + KPPP)

B. #8211; k1PP)/(1 + KAPA + KPPP)

C. -rA = (k . PA . PB)/(1 + KAPA)

D. -rA = (k . PA . PB)/(1 + KAPB + KBPB . KPPP)

E. -rA = (k . PA

297. Sum of the powers of the concentration terms in the rate equation is called the _____________ of the reaction?
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A. Order

B. Overall order

C. None of these

D. Molecularity

298. The energy balance equation over a tubular reactor under transient conditions is________________?
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A. A linear partial differential equation

B. An algebraic differential equation

C. A non-linear partial differential equation

D. An ordinary non-linear differential equation

299. The excess energy of reactants in a chemical reaction required to dissociate into products is termed as the _______________ energy?
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A. Threshold

B. Activation

C. Binding

D. Potential

300. With increase in the order of reaction (for all positive reaction orders), the ratio of the volume of mixed reactor to the volume of plug flow reactor (for identical feed composition, flow rate and conversion)?
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A. Remain same

B. Increases linearly

C. Decreases

D. Increases

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