Chemical Reaction Engineering MCQs

Welcome to our comprehensive collection of Multiple Choice Questions (MCQs) on Chemical Reaction Engineering, a fundamental topic in the field of Basic Chemical Engineering. Whether you're preparing for competitive exams, honing your problem-solving skills, or simply looking to enhance your abilities in this field, our Chemical Reaction Engineering MCQs are designed to help you grasp the core concepts and excel in solving problems.

In this section, you'll find a wide range of Chemical Reaction Engineering mcq questions that explore various aspects of Chemical Reaction Engineering problems. Each MCQ is crafted to challenge your understanding of Chemical Reaction Engineering principles, enabling you to refine your problem-solving techniques. Whether you're a student aiming to ace Basic Chemical Engineering tests, a job seeker preparing for interviews, or someone simply interested in sharpening their skills, our Chemical Reaction Engineering MCQs are your pathway to success in mastering this essential Basic Chemical Engineering topic.

Note: Each of the following question comes with multiple answer choices. Select the most appropriate option and test your understanding of Chemical Reaction Engineering. You can click on an option to test your knowledge before viewing the solution for a MCQ. Happy learning!

So, are you ready to put your Chemical Reaction Engineering knowledge to the test? Let's get started with our carefully curated MCQs!

Chemical Reaction Engineering MCQs | Page 9 of 50

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Q81.
Specific rate constant for a second order reaction

a.

is independent of temperature.

b.

varies with temperature.

c.

depends on the nature of the reactants.

d.

both (b) and (c).

Discuss
Answer: (d).both (b) and (c).
Q82.
A reversible liquid phase endothermic reaction is to be carried out in a plug flow reactor. For minimum reactor volume, it should be operated such that the temperature along the length

a.

decreases.

b.

increases.

c.

is at the highest allowable temperature throughout.

d.

first increases and then decreases.

Discuss
Answer: (c).is at the highest allowable temperature throughout.
Q83.
The rate constant of a chemical reaction increases by 100 times when the temperature is increased from 400 °K to 500 °K. Assuming transition state theory is valid, the value of E/R is

a.

8987°K

b.

9210°K

c.

8764°K

d.

8621°K

Discuss
Answer: (b).9210°K
Q84.
A batch reactor is suitable for

a.

achieving cent percent conversion of reactants into products.

b.

large scale gaseous phase reactions.

c.

liquid phase reactions.

d.

obtaining uniform polymerisation products in highly exothermic reactions.

Discuss
Answer: (c).liquid phase reactions.
Q85.
For a heterogeneous catalytic reaction

a.

free energy of activation is lowered in the presence of catalyst, which remains unchanged at the end of reaction.

b.

a relatively small amount of catalyst can cause the conversion of large amount of reactants which does not mean that catalyst concentration is important.

c.

the catalyst does not form an intermediate complex with the reactant.

d.

the surface of the catalyst does not play an important role during reaction.

Discuss
Answer: (a).free energy of activation is lowered in the presence of catalyst, which remains unchanged at the end of reaction.
Q86.
Sulphuric acid is used as a catalyst in the

a.

hydrogenation of oils.

b.

gas phase oxidation of SO₂ in chamber process.

c.

alkylation of hydrocarbons.

d.

none of these.

Discuss
Answer: (c).alkylation of hydrocarbons.
Q87.
Fractional conversion __________ with increase in pressure for ammonia synthesis reaction i.e., N₂ + 3H₂ ↔ 2NH₃.

a.

increases

b.

decreases

c.

remains unchanged

d.

unpredictable from the data

Discuss
Answer: (a).increases
Q88.
Pick out the wrong statement.

a.

The vessel dispersion number (D/UL) for plug flow and mixed flow approaches zero and infinity respectively.

b.

Space time in a flow reactor is a measure of its capacity and is equal to the residence time when the density of reaction mixture is constant.

c.

Mixed reactor is always smaller than the plug flow reactor for all positive reaction orders for a particular duty.

d.

In an ideal tubular flow reactor, mixing takes place in radial direction and there is no mixing in logitudinal direction.

Discuss
Answer: (c).Mixed reactor is always smaller than the plug flow reactor for all positive reaction orders for a particular duty.
Q89.
The reason why a catalyst increases the rate of reaction is that, it

a.

decreases the energy barrier for reaction.

b.

increases the activation energy.

c.

decreases the molecular collision diameter.

d.

none of these.

Discuss
Answer: (a).decreases the energy barrier for reaction.
Q90.
A first order irreversible reaction, A → B is carried out separately in a constant volume as well as in a variable volume reactor for a particular period. It signifies that __________ in the two reactors.

a.

both conversion as well as concentration are same

b.

conversion in both will be the same but concentrations will be different

c.

both the conversion as well as concentrations will be different

d.

none of these.

Discuss
Answer: (b).conversion in both will be the same but concentrations will be different
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