Chemical Reaction Engineering MCQ Questions & Answers

61

The reason why a catalyst increases the rate of reaction is that, it

A) Decreases the energy barrier for reaction B) Increases the activation energy C) Decreases the molecular collision diameter D) None of these

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Answer & Solution

Answer: Option A

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62

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

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Answer & Solution

Answer: Option C

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63

__________ catalytic reaction is involved in the thermal cracking of gas oil.

A) Homogeneous B) Homogeneous non C) Heterogeneous D) Heterogeneous non

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Answer & Solution

Answer: Option A

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64

A gaseous reactant is introduced in a mixed reactor of 3 litres volume at the rate of 1 litre/second. The space time is __________ seconds.

A) 1 B) 3 C) $$\frac{1}{3}$$ D) 32

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Answer & Solution

Answer: Option B

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65

In the reversible reaction of the type, A + B ⇋ AB, in general

A) Both forward and backward reactions will be exothermic B) Neither of the reactions will be en-dothermic C) The combination reaction will be exothermic, while the dissociation reaction will be endothermic D) The combination reaction will be endothermic, while the dissociation reaction will be exothermic

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Answer & Solution

Answer: Option C

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66

Which of the following is not a dimension-less group used in catalysis? (where, D = dispersion co-efficient, cm²/sec. D₁ = diffusion co-efficient, cm²/sec. L = length of the reactor, cm. t = time, sec, v = volumetric flow rate, cm³/sec. V = volume, cm³.)

A) Reactor dispersion number $$\left( {\frac{{\text{D}}}{{{\text{vL}}}}} \right)$$ B) Reduced time $$\left( {\frac{{{\text{vt}}}}{{\text{V}}}} \right)$$ C) Thiele modulus $$\left( {{\text{L}}\sqrt {\frac{{\text{k}}}{{{{\text{D}}_1}}}} } \right)$$ D) None of these

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Answer & Solution

Answer: Option D

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67

Holding time for flow reactors is __________ the space time, for constant fluid density

A) Double B) Triple C) Equal to D) None of these

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Answer & Solution

Answer: Option C

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68

Given,
3H₂ + CO = CH₄ + H₂O, K_P = 10^1.84 and 4H₂ + CO₂ = CH₄ + 2H₂O, K_P = 10^1.17
the K_P for the reaction CO + H₂O = CO₂ + H₂ is

A) 10^3.01 B) 10^-0.67 C) 10^-3.01 D) 10^0.67

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Answer & Solution

Answer: Option D

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69

Rate of a chemical reaction is not affected by the

A) Catalyst B) Temperature C) Reactant's concentration D) Number of molecules of reactants taking part in the reaction

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Answer & Solution

Answer: Option D

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70

Semibatch reactor is preferred, when a/an

A) A highly exothermic reaction is to be controlled B) Undersirable side reaction (at high concentration of one of the reactants) is to be avoided C) A gas is to be reacted with liquid (e.g. hydrogenation of fat) D) All of the above

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Answer: Option D

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Chemical Reaction Engineering MCQ Questions & Answers | Chemical Engineering