Chemical Reaction Engineering Definition Objective Questions - Set 07 - ObjectiveBooks

Chemical Reaction Engineering Definition Objective Questions - Set 07

Practice Test: Question Set - 07


1. Rate of a chemical reaction is independent of the concentration of the reactants for a __________ reaction.
    (A) Zero order
    (B) Third order
    (C) Consecutive
    (D) None of these

2. The rate expression for a heterogeneous catalytic reaction is given by, - rA = K.KA PA(1 + KA.PA + KR.PR), where K is surface reaction rate constant and KA and KR are absorption equilibrium constants of A and R respectively. If KR PR >> (1 + KA PA), the apparent activation energy EA is equal to (given E is the activation energy for the reaction and ΔHR and ΔHA are the activation energies of adsorption of R and A)
    (A) E
    (B) E + ΔHA
    (C) E + ΔHA - ΔHR)
    (D) ΔHA + ΔHR

3. Which of the following is not a unit of reaction rate?
    (A) Moles for med/(surface of catalyst) (time)
    (B) Moles formed/volume of reactor) (time)
    (C) Mole formed/volume of catalyst) (time)
    (D) None of these

4. Which of the following fixes the volume of a batch reactor for a particular conversion and production rate?
    (A) Operating conditions (e.g. pressure and temperature)
    (B) Rate constant
    (C) Density of mixture
    (D) None of these

5. The residence time distribution of an ideal CSTR is
    (A) (1/τ) exp (-t/τ)
    (B) τ exp (-t/τ)
    (C) exp (-t/τ)
    (D) (1/τ) (-t/τ)

6. Limiting reactant in a chemical reaction decides the
    (A) Rate constant
    (B) Conversion
    (C) Reaction speed
    (D) Equilibrium constant

7. __________ catalytic reaction is involved in the thermal cracking of gas oil.
    (A) Homogeneous
    (B) Non-Homogeneous
    (C) Heterogeneous
    (D) Non-Heterogeneous

8. The exit age distribution curve E(t) for an ideal CSTR with the average residence time, τ, is given by
    (A) e-t/τ
    (B) e-t/τ
    (C) 1 - e-t/τ
    (D) 1 - (e-t/τ/τ)

9. If ΔG (free energy change) for a chemical reaction is very large and negative, then the reaction is
    (A) Not feasible
    (B) Just feasible
    (C) Very much feasible
    (D) Unpredictable as ΔG is no measure of feasibility of a reaction

10. What is the value of 'n' if the reaction rate of the chemical reaction A → B, is proportional to CAn and it is found that the reaction rate triples, when the concentration of 'A' is increased 9 times?
    (A) 1/2
    (B) 1/3
    (C) 1/9
    (D) 3

11. A reaction which is catalyzed by a base is catalyzed by all substances which have a tendency to
    (A) Lose a proton
    (B) Gain a proton
    (C) Gain an electron
    (D) None of these

12. For all positive reaction orders for a particular duty,
    (A) Mixed reactor is always larger than the plug-flow reactor
    (B) Ratio of the volume of the mixed reactor to that of the plug-flow reactor decreases with order
    (C) Reactor size is independent of the type of flow
    (D) Density variation during reaction affects design

13. When a catalyst increases the rate of chemical reaction, the rate constant
    (A) Decreases
    (B) Increases
    (C) Remain constant
    (D) Become infinite

14. In which of the following gaseous phase reactions, the equilibrium of the reaction remains unaffected by pressure changes?
    (A) 2O3  3O2
    (B) N2 + O2  2NO
    (C) 2NO2  N2O4
    (D) 2SO2 + O2  2SO3

15. What is the order of a chemical reaction whose rate is deter-mined by the variation of one concentration term only?
    (A) Zero
    (B) First
    (C) Second
    (D) Third

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