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Chemical Engineering :: Chemical Reaction Engineering

  1. In a first order reaction, the time required to reduce the concentration of reactant from 1 mole/litre to 0.5 mole/litre will be __________ that required to reduce it from 10 moles/litre to 5 moles/litre in the same volume.

  2. A.
    more than
    B.
    less than
    C.
    same as
    D.
    data insufficient; can't be predicted.

  3. Photo-chemical reactions occur in presence of

  4. A.
    sunlight.
    B.
    darkness,
    C.
    solid catalysts.
    D.
    monochromatic radiation only.

  5. '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

  6. A.
    V/n
    B.
    V
    C.
    V.n
    D.
    1/V

  7. Knudsen diffusion is directly proportional to

  8. A.
    T
    B.
    T
    C.
    1/T
    D.
    T2

  9. Fractional conversion __________ for an exothermic reversible chemical reaction, when the temperature is maximum.

  10. A.
    increases
    B.
    remains unchanged
    C.
    decreases
    D.
    unpredictable from the data

  11. Non-catalytic fluid-solid reactions are represented by __________ model.

  12. A.
    continuous reaction
    B.
    unreacted core
    C.
    both (a) and (b)
    D.
    neither (a) and (b)

  13. A pulse tracer is introduced in an ideal CSTR (with a mean residence time ι) at time, t = 0. The time taken for the exit concentration of the tracer to reach half of its initial value will be

  14. A.
    B.
    0.5τ
    C.
    τ/0.693
    D.
    0.693τ

  15. On application of pressure to the equilibrium system, ice water ; which of the following phenomenon will occur ?

  16. A.
    Water will evaporate
    B.
    Equilibrium will not be attained
    C.
    More ice will be formed
    D.
    More water will be formed.

  17. Participation of __________ is involved in the occurrence of a chemical reaction.

  18. A.
    protons
    B.
    neutrons
    C.
    electrons
    D.
    none of these

  19. Promoter.

  20. A.
    initiates a chemical reaction and is a catalyst by itself.
    B.
    atlers the position of equilibrium in a reversible reaction.
    C.
    increases the number of active centres by increasing the unevenness of catalyst surface and by creating discontinuities in the crystals.
    D.
    all (a), (b) and (c).