Chemical Engineering - Chemical Reaction Engineering

26. 

In a consecutive reaction system when E1 is much greater than E2, the yield of B increases with the

A. increase of temperature.
B. decrease of temperature.
C. increase in initial concentration of A.
D. decrease in initial concentration of A.

Answer: Option A

Explanation:

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27. 

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.

Answer: Option C

Explanation:

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28. 

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

Answer: Option B

Explanation:

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29. 

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.

Answer: Option C

Explanation:

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30. 

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.

Answer: Option A

Explanation:

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