Chemical Reaction Engineering Example Problems MCQ - Set 23 - ObjectiveBooks

Chemical Reaction Engineering Example Problems MCQ - Set 23

Practice Test: Question Set - 23

1. The rate of the heterogeneous catalytic reaction A(g) + B(g) → C(g) is given by -rA = k.KA.pA.PB/(1 + KA.PA + Kc.pc), where KA and Kc 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

2. The fractional volume change of the system for the isothermal gas phase reaction, A → 3B , between no conversion and complete conversion is
    (A) 0.5
    (B) 1
    (C) 2
    (D) 3

3. With increase in the order of reaction (for all positive reaction orders), the ratio of the volume of mixed reactor to the volume of plug flow reactor (for identical feed composition, flow rate and conversion).
    (A) Increases
    (B) Decreases
    (C) Remain same
    (D) Increases linearly

4. For the chemical reaction P → Q, it is found that the rate of reaction doubles as the concentration of 'P' is doubled. If the reaction rate is proportional to Cpn, then what is the value of 'n' for this chemical reaction?
    (A) 0
    (B) 1
    (C) 2
    (D) 3

5. For a mixed flow reactor operating at steady state, the rate of reaction is given by
    (A) (FA0/V) - (dCA/dt)
    (B) (FA0/V) + (dCA/dt)
    (C) (FA0/V) XA
    (D) -(dCA/dt)

6. The rate constant of a chemical reaction decreases by decreasing the
    (A) Pressure
    (B) Concentration of reactants
    (C) Temperature
    (D) Duration of reaction

7. A Catalyst
    (A) Increases the equilibrium concentration of the product
    (B) Changes the equilibrium constant of the reaction
    (C) Shortens the time to reach the equilibrium
    (D) None of these

8. If CA is the quantity of reactants initially present, the quantity left after 'n' half periods will be equal to
    (A) (CA/2)n
    (B) )n CA
    (C) (CA/2)1/n
    (D) (CA)1/2n

9. The conversion in a mixed reactor/accomplishing a reaction A → 3R is 50% when gaseous reactant 'A' is introduced at the rate of 1 liter/second and the leaving flow rate is 2 liters/second. The holding time for this operation is __________ second.
    (A) 0.5
    (B) 1
    (C) 2
    (D) 3

10. In an exothermic chemical reaction, the reactants compared to the products have
    (A) Higher temperature
    (B) More energy
    (C) Less energy
    (D) Same energy

11. Reactions with high activation energy are
    (A) Very temperature sensitive
    (B) Temperature insensitive
    (C) Always irreversible
    (D) Always reversible

12. 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

13. When an exothermic reversible reaction is conducted adiabatically, the rate of reaction
    (A) Continuously increases
    (B) Continuously decreases
    (C) Passes through a maximum
    (D) Passes through a minimum

14. BET apparatus
    (A) Measures the catalyst surface area directly
    (B) Operates at very high pressure
    (C) Is made entirely of stainless steel
    (D) None of these

15. If the pore diffusion controls in a catalytic reaction, the apparent activation energy Ea is equal to
    (A) The intrinsic activation energy E
    (B) (E + ED) where ED is activation due to diffusion
    (C) (E + ED)/2
    (D) ED/2

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