Chemical Reaction Engineering Essentials Exercises and Examples MCQ - Set 21 - ObjectiveBooks

Chemical Reaction Engineering Essentials Exercises and Examples MCQ - Set 21

Practice Test: Question Set - 21

1. With increase in K2/K1 in case of a unimolecular type elementary reactions as shown in the bellow figure, the fractional yield of 'R' in mixed reactor (for a given conversion of 'A').
    (A) Decreases
    (B) Increases
    (C) Increases linearly
    (D) Remain same

2. For a first order reaction carried out in a plug flow reactor, the space time is
    (A) (1/k) ln C0/C
    (B) (1/k) ln C/C0
    (C) k ln C0/C
    (D) k ln C/C0

3. Pick out the wrong statement.
    (A) Use of different catalysts in a reversible catalytic chemical reaction does not change the equilibrium composition
    (B) Alumina is added as a promoter to iron catalyst in ammonia synthesis reaction
    (C) Activation energy for a reaction is obtained from the intercept of the Arrhenius plot
    (D) Presence of inerts affects the equilibrium conversion of reactants in a chemical reaction

4. Specific rate constant for a second order reaction
    (A) Is independent of temperature
    (B) Varies with temperature
    (C) Depends on the nature of the reactants
    (D) Both (b) and (c)

5. If helium is introduced in a reactor containing O2, SO2 and SO3 at equilibrium, so that total pressure increases while volume and temperature remains constant. In this case the dissociation of SO3 (as per Le Chatlier principle).
    (A) Decreases
    (B) Increases
    (C) Remains unaltered
    (D) Changes unpredictably

6. A spherical porous catalyst particle of radius R is subjected to reactant A which reacts to form B by a zero order surface reaction A → B. Film mass transfer resistance is negligible and pore diffusion of A is rate controlling. The effectiveness factor of the catalyst is reported as 7/8. Which of the following statement is true?
    (A) Inner catalyst core of radius R/8 does not participate in reaction
    (B) Inner catalyst core of radius R/2 does not participate in reaction
    (C) Inner catalyst core of radius 7R/8 does not participate in reaction
    (D) Effectiveness factor for a zero order reaction cannot be 7/8 as it must always be 1

7. Chemical reaction rate of a component depends upon the
    (A) Composition of the component only
    (B) Temperature of the system
    (C) Pressure of the system
    (D) All (a), (b) and (c)

8. If the time required to complete a definite fraction of reaction varies inversely as the concentration of the reactants, then the order of reaction is
    (A) 1
    (B) 2
    (C) 3
    (D) 4

9. Space time equals the mean residence time
    (A) When the density of the reaction mixture is constant
    (B) For large diameter tubular reactor
    (C) For narrow diameter tubular reactor
    (D) For CSTR

10. Velocity of a reaction depends upon the
    (A) Nature of the reactants
    (B) Concentration of the reactants
    (C) Temperature at which the reaction is carried
    (D) All (a), (b) and (c)

11. The ratio of moles of a reactant converted into the desired product to that converted into unwanted product is called
    (A) Operational yield
    (B) Relative yield
    (C) Selectivity
    (D) None of these

12. From among the following, choose one which is not an exothermic process.
    (A) Methanol synthesis
    (B) Catalytic cracking
    (C) Ammonia synthesis
    (D) Oxidation of sulphur

13. The unit of frequency factor in Arrhenius equation is
    (A) Same as that of rate constant
    (B) Same as that of activation energy
    (C) Dimensionless
    (D) None of these

14. A batch adiabatic reactor at an initial temperature of 373°K is being used for the reaction, A → B. Assume the heat of reaction is - 1kJ/mole at 373°K and heat capacity of both A and B to be constant and equal to 50J/mole.K. The temperature rise after a conversion of 0.5 will be:
    (A) 5°C
    (B) 10°C
    (C) 20°C
    (D) 100°C

15. From collision theory, the reaction rate constant is proportional to
    (A) exp (-E/RT)
    (B) exp (-E/2RT)
    (C) √T
    (D) Tm exp (-E/RT)

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