MCQs for Chemical Reaction Engineering - Set 25 - ObjectiveBooks

MCQs for Chemical Reaction Engineering - Set 25

Practice Test: Question Set - 25

1. Half-life period for a first order reaction is __________ the initial concentration of the reactant.
    (A) Directly proportional to
    (B) Inversely proportional to
    (C) Independent of
    (D) None of these

2. For an isothermal second order aqueous phase reaction, A → B, the ratio of the time required for 90% conversion to the time required for 45% conversion is:
    (A) 2
    (B) 4
    (C) 11
    (D) 22

3. In solid catalyzed reactions the diffusional effects are more likely to affect the overall rate of reaction for
    (A) Fast reactions in catalyst of small pore diameter
    (B) Fast reaction in catalyst of large pore diameter
    (C) Slow reactions in catalyst of small pore diameter
    (D) Slow reactions in catalyst of large pore diameter

4. Pick out the correct statement.
    (A) Reactions with high activation energies are very temperature sensitive
    (B) Chemical equilibrium is a static state
    (C) A photochemical reaction is catalyzed by light
    (D) A chemical reaction occurs when the energy of the reacting molecule is less than the activation energy of the reaction

5. The temperature dependence of reaction rate constant (K) by Arrhenius law is given by
    (A) K α e-E/RT
    (B) K α eE/RT
    (C) K α T . e-E/RT
    (D) K α √T . e-E/RT

6. A photochemical reaction is
    (A) Accompanied with emission of light
    (B) Catalyzed by light
    (C) Initiated by light
    (D) All (a), (b) & (c)

7. Which one is the rate controlling step in a solid-gas non-catalytic reaction occurring at very high temperature?
    (A) Pore diffusion
    (B) Film diffusion
    (C) Ash layer diffusion
    (D) Chemical reaction

8. For high conversion in a highly exothermic solid catalyzed reaction, use a __________ bed reactor.
    (A) Fixed
    (B) Fluidized bed reactor followed by a fixed
    (C) Fixed bed reactor followed by a fluidized
    (D) Fluidized

9. The molecularity and the order of reaction respectively, for the hydrolysis of methyl acetate in presence of acids are
    (A) 2 & 1
    (B) 11 & 2
    (C) 2 & 2
    (D) 1 & 1

10. Sometimes, batch process is preferred over continuous process, when the product
    (A) Quality & yield cannot be achieved in continuous processes, because of long residence time
    (B) Sales demand is fluctuating
    (C) Both (a) & (b)
    (D) Neither (a) nor (b)

11. 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

12. 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

13. With increase in initial concentration, the fractional conversion of a first order reaction in a given time
    (A) Increases
    (B) Decreases
    (C) Remain constant
    (D) Unpredictable

14. 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

15. In a reversible reaction, a catalyst increases the rate of forward reaction
    (A) Only
    (B) To a greater extent than that of the backward reaction
    (C) And decreases that of the backward reaction
    (D) And the backward reaction equally

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