Chemical Reaction Engineering MCQ Questions & Answers

91

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

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Answer & Solution

Answer: Option B

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92

When all the limiting reactant is consumed in the reaction, the operational yield __________ the relative yield.

A) Is greater than B) Is smaller than C) Equals D) Can be either greater or smaller than (depends on the type of reaction)

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Answer: Option C

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93

The experimentally determined overall order of the reaction, A + B → C + D, is two. Then the

A) Reaction is elementary with a molecularity of 2 B) Molecularity of the reaction is 2, but the reaction may not be elementary C) Reaction may be elementary with molecularity of 2 D) Reaction is elementary but the molecularity may not be 2

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Answer & Solution

Answer: Option A

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94

In a reaction, the threshold energy is equal to (where, A = activation energy N = normal energy of reactants)

A) A B) N C) A+N D) A-N

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Answer: Option C

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95

What is the unit of the rate constant in a chemical reaction in which 10% of the reactant decomposes in one hour, 20% in two hours, 30% in three hours and so on?

A) Litre/mole.second B) Moles/litre.second C) Litre/mole D) Litre/second

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Answer & Solution

Answer: Option A

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96

A back mix reactor is

A) Suitable for gas phase reactions B) Ideal at very low conversion C) Same as plug flow reactor (PFR) D) Same as ideal stirred tank reactor

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Answer: Option D

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97

A batch reactor is

A) Suitable for gas-phase reactions on commercial scale B) Suitable for liquid phase reactions involving small production rate C) Least expensive to operate for a given rate D) Most suitable for very large production rate

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Answer & Solution

Answer: Option B

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98

A Catalyst

A) Increases the equilibrium concentration of the product B) Changes the equilibrium constant of the reaction C) Shortens the time to reach the equilibrium D) None of these

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Answer: Option C

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99

A catalyst promoter

A) Improves the activity of a catalyst B) Acts as a catalyst support C) Itself has very high activity D) All of the above

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Answer & Solution

Answer: Option A

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100

The equilibrium constant K of a chemical reaction depends on

A) Temperature only B) Pressure only C) Temperature and pressure D) Ratio of reactants

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Answer & Solution

Answer: Option A

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Chemical Reaction Engineering MCQ Questions & Answers | Chemical Engineering