Chemical Engineering: Chemical Reaction Basics MCQs - Set 05 - ObjectiveBooks

Chemical Engineering: Chemical Reaction Basics MCQs - Set 05

Practice Test: Question Set - 05

1. The equilibrium constant of a catalytic chemical reaction __________ due to the presence of a catalyst.
    (A) Increases
    (B) Decreases
    (C) Remain unaffected
    (D) Unpredictable from the data

2. The sequence in which three CSTR's of volumes 5, 10 and 15 m3 will be connected in series to obtain the maximum production in a second order irreversible reaction is
    (A) 15, 10, 5
    (B) 5, 10, 15
    (C) 10, 5, 15
    (D) 10, 15, 5

3. Decomposition rate of a liquid 'X' which decomposes as per the reaction as shown in the bellow figure is given by:
    (A) K1 . CX
    (B) (K1 + K2 + K3) CX
    (C) (K1 + K2) CX
    (D) (K2 + K3) CX

4. What is the dispersion number for a CSTR?
    (A) 0
    (B) 1
    (C) < 1

5. A first order gaseous phase reaction is catalyzed by a non-porous solid. The kinetic rate constant and the external mass transfer co-efficients are k and kg respectively. The effective rate constant (keff) is given by
    (A) keff = k + kg
    (B) keff = (kkg)/2
    (C) keff = (kkg)1/2
    (D) 1/keff = 1/k + 1/kg

6. __________ gas is normally employed in B.E.T. method of finding out the surface area of catalyst.
    (A) N2
    (B) H2
    (C) CO2
    (D) He

7. For the non-catalytic reaction of particles with surrounding fluid, the time needed to achieve the same fractional conversion for particles of different but unchanging sizes is proportional to the square of particle diameter, when the __________ is the controlling resistance.
    (A) Film diffusion
    (B) Diffusion through ash layer
    (C) Chemical reaction
    (D) Either (a), (b) or (c)

8. Catalyst is a substance, which __________ chemical reaction.
    (A) Increases the speed of a
    (B) Decreases the speed of a
    (C) Can either increase or decrease the speed of a
    (D) Alters the value of equilibrium constant in a reversible

9. A chemical reaction occurs when the energy of the reacting molecules is __________ the activation energy of the reaction.
    (A) Less than
    (B) Equal to
    (C) More than
    (D) Equal to or more than

10. The rate constant of a chemical reaction increases by increasing the
    (A) Temperature
    (B) Pressure
    (C) Reactant's concentration
    (D) None of these

11. Pure A in gas phase enters a reactor 50% of this A is converted to B through the reaction, A → 3B. Mole fraction of A in the exit stream is
    (A) 1/2
    (B) 1/3
    (C) 1/4
    (D) 1/5

12. Arrhenius equation shows the variation of __________ with temperature.
    (A) Reaction rate
    (B) Rate constant
    (C) Energy of activation
    (D) Frequency factor

13. A second order reaction of the form A + B → C is called a pseudo-first order reaction, when
    (A) CA0 = CB0
    (B) CA0 > CB0
    (C) CB0 > CA0
    (D) CB0 ≥ CB0

14. The rate of the chemical reaction A → B doubles as the concentration of A i.e.., CA is doubled. If rate of reaction is proportional to CAn, then what is the value of n for this reaction?
    (A) 0
    (B) 0.5
    (C) 1
    (D) 2

15. The following gas phase reactions are carried out isothermally in a CSTR.
     A → 2R ; r1 = k1pA ;
     k1 = 20mole/(sec.m3 bar)
     A → 3S ; r2 = k2 pA ;
     k2 = 40mole/(sec.m3 .bar)
What is the maximum possible value of FR(mole/sec.)?
    (A) 1/3
    (B) 1/2
    (C) 2/3
    (D) 2

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