Chemical Reaction Engineering MCQ Questions & Answers

21

For the liquid phase zero order irreversible reaction A → B, the conversion of A in a CSTR is found to be 0.3 at a space velocity of 0.1 min^-1. What will be the conversion for a PFR with a space velocity of 0.2 min^-1?
(Assume that all the other operating conditions are the same for CSTR and PFR.)

A) 0.15 B) 0.30 C) 0.60 D) 0.90

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Answer & Solution

Answer: Option C

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22

Molecularity of an elementary reaction, P + Q → R + S is

A) 1 B) 2 C) 3 D) 4

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Answer & Solution

Answer: Option B

Solution:

The molecularity of an elementary reaction represents the number of molecules or particles that come together to react and form the products. In the given elementary reaction:

P + Q → R + S

There are two reactant molecules (P and Q) that come together to form two product molecules (R and S).

Therefore, the molecularity of this elementary reaction is 2.

So, the correct answer is Option B: 2.

23

The fractional volume change between no conversion and complete conversion, for the isothermal gas phase reaction, 2A → R, is

A) 0.5 B) -0.5 C) 1 D) 1.5

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Answer & Solution

Answer: Option B

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24

A catalyst in a chemical reaction

A) Decreases the activation energy B) Alters the reaction mechanism C) Increases the frequency of collisions of reacting species D) All of the above

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Answer & Solution

Answer: Option D

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25

For a __________ order reaction, the units of rate constant and rate of reaction are the same.

A) Zero B) First C) Second D) Fractional

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Answer & Solution

Answer: Option A

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26

When the reaction is dominated by in-traparticle diffusion, the apparent order of reaction (n_D) as measured is related to the true order (n) as

A) $${{\text{n}}_{\text{D}}} = \frac{{{\text{n}} + 1}}{2}$$ B) $${{\text{n}}_{\text{D}}} = \frac{{\text{n}}}{2}$$ C) $${{\text{n}}_{\text{D}}} = {\text{n}} + 1$$ D) None of these

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Answer & Solution

Answer: Option A

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27

Carbon particles accummulated on the catalyst used in the gas oil cracking lies in the category of __________ poison.

A) Deposited B) Chemisorbed C) Selectivity D) Stability

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Answer & Solution

Answer: Option A

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28

A chemical reaction occurs when the energy of the reacting molecules is __________ the activation energy of the reaction.

A) Less than B) Equal to C) More than D) Equal to or more than

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Answer & Solution

Answer: Option D

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29

BET apparatus

A) Measures the catalyst surface area directly B) Operates at very high pressure C) Is made entirely of stainless steel D) None of these

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Answer & Solution

Answer: Option D

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30

Which of the following is the most suitable for isothermal operation?

A) Batch reactor B) Back-mix reactor C) Plug-flow reactor D) Fixed bed reactor

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Answer & Solution

Answer: Option B

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Chemical Reaction Engineering MCQ Questions & Answers | Chemical Engineering