Chemical Reaction Engineering and Reactor Technology Questions - Set 12 - ObjectiveBooks

Chemical Reaction Engineering and Reactor Technology Questions - Set 12

Practice Test: Question Set - 12

1. Rate of an autocatalytic chemical reaction is a function of
    (A) Temperature only
    (B) Pressure only
    (C) Composition only
    (D) All (a), (b) and (c)

2. Time required for 50% decomposition of a liquid in an isothermal batch reactor following first order kinetics is 2 minutes. The time required for 75% decomposition will be about __________ minutes.
    (A) 3
    (B) 4
    (C) 6
    (D) 10

3. The reactions with low activation energy are
    (A) Always spontaneous
    (B) Slow
    (C) Fast
    (D) Non-spontaneous

4. The concentration of A in a first order reaction, A → B, decreases
    (A) Linearly with time
    (B) Exponentially with time
    (C) Very abruptly towards the end of the reaction
    (D) Logarithmically with time

5. A reaction which is catalyzed by an acid is also catalyzed by any substance, which has a tendency to
    (A) Lose a proton
    (B) Gain a proton
    (C) Lose an electron
    (D) None of these

6. 'n' number of plug flow reactors (P.F.R) in series with a total volume 'V' gives the same conversion as one P.F.R. of volume
    (A) V/n
    (B) V
    (C) V.n
    (D) 1/V

7. Chemical kinetics can predict the __________ of a chemical reaction.
    (A) Rate
    (B) Feasibility
    (C) Both (a) & (b)
    (D) Neither (a) nor (b)

8. Pick out the correct statement.
    (A) A catalyst speeds up the forward reaction but slows shown the reverse reaction
    (B) Addition of catalyst changes the equilibrium constant
    (C) Pressure changes do not change the equilibrium concentrations
    (D) The composition of equilibrium is changed by catalyst

9. The reaction in which the rate equation corresponds to a stoichiometric equation, is called a/an __________ reaction.
    (A) Elementary
    (B) Non-elementary
    (C) Parallel
    (D) Autokinetic

10. Half life period of a chemical reaction is proportional to CA0-1, if the reaction is of __________ order.
    (A) First
    (B) Zero
    (C) Second
    (D) Third

11. Reaction rate of a first order reaction, which is half completed in 23 minutes will be
    (A) 0.03 sec-1
    (B) 0.03 min-1
    (C) 0.03 hr-1
    (D) 0.05 min-1

12. B.E.T. method of finding out surface area of a catalyst, uses the extension of __________ isotherm.
    (A) Langmuir
    (B) Freundlich
    (C) Tempkin
    (D) None of these

13. A typical example of an exothermic reversible reaction conducted at high pressure in industry is
    (A) Dehydration of ethanol
    (B) Methanol synthesis
    (C) Reformation of methane
    (D) Polymerization of ethylene

14. Vegetable oils are hydrogenated in a __________ reactor.
    (A) Slurry
    (B) Plug flow
    (C) Homogeneous catalytic
    (D) None of these

15. Pick out the wrong statement.
    (A) Autocatalytic reactions are exemplified by microbial fermentation reactions
    (B) The slowest step has the greatest influence on the overall reaction rate in case of an irreversible series reaction
    (C) The fractional conversion at any time is same for both the constant as well as the variable volume system in case of an irreversible unimolecular type first order reaction
    (D) Hydrolysis of ester in presence of alkali or acid is a zero order reaction

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