Chemical Reaction Engineering MCQ Questions & Answers

1

For the liquid phase parallel reactions:
R, r_R = K₁.C_A₂; E₁ = 80 KJ/mole
S, r_S = K₁.C_A; E₂ = 120 KJ/mole
The desired product is R. A higher selectivity of R will be achieved, if the reaction is conducted at

A) Low temperature in a CSTR B) High temperature in a CSTR C) Low temperature in a PFR D) High temperature in a PFR

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Answer & Solution

Answer: Option D

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2

Which of the following is a controlling factor in very fast heterogeneous reaction?

A) Heat and mass transfer effects B) Pressure C) Temperature D) Composition of reactant

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Answer & Solution

Answer: Option A

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3

The catalytic converter for conversion of SO₂ to SO₃ by contact process should have a feed with SO₂ content between

A) 2 - 5% B) 7 - 10% C) 12 - 15% D) 20 - 25%

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Answer & Solution

Answer: Option B

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4

In which of the following gaseous phase reactions, the equilibrium of the reaction remains unaffacted by pressure changes ?

A) $$2{{\text{O}}_3} \rightleftharpoons 3{{\text{O}}_2}$$ B) $${{\text{N}}_2} + {{\text{O}}_2} \rightleftharpoons 2{\text{NO}}$$ C) $$2{\text{N}}{{\text{O}}_2} \rightleftharpoons {{\text{N}}_2}{{\text{O}}_4}$$ D) $$2{\text{S}}{{\text{O}}_2} + {{\text{O}}_2} \rightleftharpoons 2{\text{S}}{{\text{O}}_3}$$

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Answer & Solution

Answer: Option B

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5

A multiple reaction may be classified as a __________ reaction.

A) Consecutive or side B) Parallel or side C) Mixed D) All of the above

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Answer & Solution

Answer: Option D

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6

The single parameter model proposed for describing non-ideal flow is the __________ model.

A) Tank in series B) Dispersion C) Both A & B D) Neither A nor B

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Answer & Solution

Answer: Option C

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7

Pick out the wrong statement.

A) 'Hold back' is defined as the fraction of material that stays longer than the mean residence time B) Study of non-ideal flow reactor is done experimentally by stimulus-response technique C) For studying a chemical reaction, it is desirable to monitor the reactants during initial stages and the products during the final stages of reaction D) A batch reactor can not be used to study the kinetics of catalytic reaction

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Answer & Solution

Answer: Option D

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8

The exit age distribution of fluid leaving a vessel is used to know the

A) Activation energies of a reaction B) Reaction mechanism C) Extent of non-ideal flow in the vessel D) None of these

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Answer & Solution

Answer: Option C

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9

In case of staged packed bed reactors carrying out exothermic reaction, use

A) High recycle for pure gas B) Plug flow for dilute liquid requiring no large preheating of feed C) Cold shot operations for a dilute solution requiring large preheating to bring the stream upto the reaction temperature D) All of the above

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Answer & Solution

Answer: Option D

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10

The rate expression for a heterogenous catalytic reaction is given by, - r_A = K.K_A P_A(1 + K_A.P_A + K_r.P_R), where K is surface reaction rate constant and K_A and K_R are absorption equilibrium constants of A and R respectively. If K_R P_R >> (1 + K_A P_A), the apparent activation energy E_A is equal to (given E is the activation energy for the reaction and ΔH_R and ΔH_A are the activation energies of adsorption of R and A)

A) E B) E + ΔH_A C) E + ΔH_A - ΔH_R D) ΔH_A + ΔH_R

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Answer & Solution

Answer: Option C

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Chemical Reaction Engineering MCQ Questions & Answers | Chemical Engineering