Chemical Reaction Engineering MCQ Questions & Answers

61

The order of a chemical reaction is

A) An experimentally determined quantity B) Always equal to the total stoichiometric number of reactants C) Never fractional D) None of these

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Answer & Solution

Answer: Option A

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62

With increase in initial concentration, the fractional conversion of a first order reaction in a given time

A) Increases B) Decreases C) Remains constant D) Unpredictable

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Answer & Solution

Answer: Option C

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63

Pick out the wrong statement:

A) Chemical reactions with high activation energy are very temperature sensitive B) A flat velocity profile exists in a plug flow reactor C) The residence time for all the elements of fluid in case of a P.F.R. need not be same D) Half life of a reaction increases with increased initial concentration for reaction orders more than one

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Answer & Solution

Answer: Option C

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64

The rate of the heterogenous catalytic reaction A(g) + B(g) → C(g) is given by $$ - {{\text{r}}_{\text{A}}} = \frac{{{\text{k}}.{{\text{K}}_{\text{A}}}.{{\text{p}}_{\text{A}}}.{{\text{P}}_{\text{B}}}}}{{1 + {{\text{K}}_{\text{A}}}.{{\text{P}}_{\text{A}}} + {{\text{K}}_{\text{C}}}.{{\text{p}}_{\text{C}}}}},$$ where K_A and K_C are the adsorption equilibrium constants. The rate controlling step for this reaction is

A) Absorption of A B) Surface reaction between absorbed A and absorbed B C) Surface reaction between absorbed A and B in the gas phase D) Surface reaction between A in the gas phase and absorbed B

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Answer & Solution

Answer: Option C

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65

The knowledge of initial concentration and rate constant is necessary to determine the half life time of a reaction of __________ order.

A) Zero B) First C) Second D) None of these

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Answer & Solution

Answer: Option C

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66

The irreversible reaction, X → Y, is the special case of the reversible reaction, X ⇋ Y, in which the

A) Equilibrium constant is infinite B) Fractional conversion of C) Concentration of D) All of the above

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Answer & Solution

Answer: Option D

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67

Photo-chemical reactions occur in presence of

A) Sunlight B) Darkness C) Solid catalysts D) Monochromatic radiation only

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Answer & Solution

Answer: Option A

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68

In an ideal mixed reactor (at steady state), the

A) Space time is equivalent to holding time for constant density systems B) Composition throughout the reactor remains same C) Exit stream has the same composition as the fluid within the reactor D) All of the above

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Answer & Solution

Answer: Option D

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69

An endothermic aqueous phase first order irreversible reaction is carried out in an adiabatic plug flow reactor. The rate of reaction

A) Is maximum at the inlet of the reactor B) Goes through a maximum along the length of the reactor C) Goes through a minimum along the length of the reactor D) Is maximum at the exit of the reactor

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Answer & Solution

Answer: Option A

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70

The synthesis of proteins and metabolism in biological objects occur in the presence of biocatalyst called

A) A ferment or an enzyme B) Haemoglobin C) Fungi D) None of these

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Answer & Solution

Answer: Option A

Solution:

Biocatalysts are substances that increase the rate of biochemical reactions in living organisms without being consumed in the process.

Proteins synthesis and metabolism: These vital biological processes occur in the presence of enzymes, which act as natural catalysts. Enzymes are often referred to as ferments in older terminology.

Why not others:
Haemoglobin is a respiratory pigment that transports oxygen, not a catalyst for metabolism.

Fungi are microorganisms that may produce enzymes but are not themselves the direct biocatalysts.

"None of these" is incorrect because enzymes are the true catalysts involved in these reactions.

Conclusion: The correct answer is a ferment or an enzyme, since they catalyze protein synthesis and metabolic processes.

Chemical Reaction Engineering MCQ Questions & Answers | Chemical Engineering