Chemical Reaction MCQs

188 MCQs — Chemical Engineering MCQs (Page 9 of 19)

Attempt Chemical Reaction Quiz

The order of a chemical reaction is__________________?

A. An experimentally determined quantity
B. Always equal to the total stoichiometric number of reactants
C. Never fractional
D. None of these

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The rate of reaction does not decrease appreciably as the reaction proceeds in case of ______________ reactions?

A. Autocatalytic
B. Exothermic
C. Endothermic
D. Autothermal

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Space time in flow reactor is____________________?

A. Usually equal to the residence time
B. The reciprocal of the space velocity
C. A measure of its capacity
D. Both a. and b.

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With the same reaction time, initial concentration and feed rate, the reaction 2A → B is carried out separately in CSTR and P.F. reactor of equal volumes. The conversion will be__________________?

A. Higher in p.f. reactor
B. Higher in cstr
C. Same in both the reactors
D. Data insufficient; can’t be predicted

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If pore diffusion is the controlling step in a solid catalysed reaction, the catalyst___________________?

A. Porosity is very important
B. Porosity is of less importance
C. Internal surface area is utilised efficiently
D. None of these

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The energy of activation of a chemical reaction ?

A. Is same as heat of reaction at constant pressure
B. Is the minimum energy which the molecules must have before the reaction can take place
C. Varies as fifth power of the temperature
D. Both b. and c.

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For identical flow rate, feed composition and for elementary first order reactions, ‘N’ equal sized mixed reactors in series with a total volume ‘V’ gives the same conversion as a single plug flow reactor of volume ‘V’ for constant density systems. This is true, when the value of ‘N’ is ___________________?

A. 1
B. > 1
C. ∞
D. ≥ 1

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Which of the following does not produce a change in the value of rate constant of a reaction ?

A. Pressure
B. Temperature
C. Concentration and catalyst
D. None of these

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The dispersion number of perfect mixed flow is__________________?

A. 0
B. > 150
C. ∞
D. < 2100

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In autocatalytic reactions ?

A. One of the reactants acts as a catalyst
B. One of the products acts as a catalyst
C. Catalysts have very high selectivity
D. No catalyst is used

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