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Chemical Engineering :: Chemical Reaction Engineering

  1. Half life period of decomposition of a liquid 'A' by irreversible first order reaction is 12 minutes. The time required for 75% conversion of 'A' is __________ minutes.

  2. A.
    18
    B.
    24
    C.
    6
    D.
    12

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  3. Decomposition rate of a liquid 'X' which decomposes as per the reaction is given by

  4. A.
    K1 . CX
    B.
    (K1 + K2 + K3)CX
    C.
    (K1 + K2)CX
    D.
    (K2 + K3)CX

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  5. With increase in the space time of an irreversible isothermal reaction being carried out in a P.F. reactor, the conversion will

  6. A.
    increase
    B.
    decrease
    C.
    remain same
    D.
    data in insufficient; can't be predicted

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  7. A catalyst promoter

  8. A.
    improves the activity of a catalyst.
    B.
    acts as a catalyst support.
    C.
    itself has very high activity.
    D.
    all (a), (b) and (c).

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  9. In case of a P.F.R., there

  10. A.
    may be lateral mixing of fluid.
    B.
    should not be any mixing along the flow path.
    C.
    both (a) and (b).
    D.
    neither (a) nor (b).

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  11. 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.

  12. A.
    film diffusion
    B.
    diffusion through ash layer
    C.
    chemical reaction
    D.
    either (a), (b) or (c)

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  13. If ΔG (free energy change) for a chemical reaction is very large and negative, then the reaction is

  14. A.
    not feasible.
    B.
    just feasible.
    C.
    very much feasible.
    D.
    unpredictable as ΔG is no measure of feasibility of a reaction.

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  15. In a zero order reaction, reactants concentration does not change with time and the

  16. A.
    time for half change is half the time taken for completion of the reaction.
    B.
    time for half change is independent of the initial concentration.
    C.
    time for completion of the reaction is independent of the initial concentration.
    D.
    reaction rate is trebled when the initial concentration is trebled.

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