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  1. A first order gaseous phase reaction is catalysed 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

  2. A.

     keff = k + kg

    B.

     keff = (k+ kg)/2

    C.

     keff = (kkg)1/2

    D.

     1/keff = 1/k + 1/kg

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  3. The half life period of a first order reaction is given by (where, K = rate constant. )

  4. A.

     1.5 K

    B.

     2.5 K

    C.

     0.693/K

    D.

     6.93 K

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  5. Catalyst is a substance, which __________ chemical reaction.

  6. 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

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  7. A chemical reaction is of zero order, when the reaction rate is (where, CA = concentration of reactant)

  8. A.

     ∝ CA

    B.

     ∝ 1/CA

    C.

     Independent of temperature

    D.

     None of these

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  9. Higher free energy of activation of a chemical reaction (at a given temperature) implies

  10. A.

     Slower rate of reaction

    B.

     Higher rate of reaction

    C.

     Higher equilibrium conversion

    D.

     Both B and C

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  11. If the rate of a chemical reaction becomes slower at a given temperature, then the

  12. A.

     Initial concentration of the reactants remains constant

    B.

     Free energy of activation is lower

    C.

     Entropy changes

    D.

     Free energy of activation is higher

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  13. The eddy diffusivity for a liquid in plug flow must be

  14. A.

     1

    B.

     0

    C.

     ∞

    D.

     Between 0 and 1

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  15. The most suitable reactor for carrying out an auto-thermal reaction is a

  16. A.

     Batch reactor

    B.

     CSTR

    C.

     Semi-batch reactor

    D.

     Plug-flow reactor

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  17. In an ideal tubular-flow reactor

  18. A.

     There is no mixing in longitudinal direction

    B.

     Mixing takes place in radial direction

    C.

     There is a uniform velocity across the radius

    D.

     All of the above

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  19. A reactor is generally termed as an autoclave, when it is a

  20. A.

     High pressure batch reactor

    B.

     Atmospheric pressure tank reactor

    C.

     High pressure tubular reactor

    D.

     Atmospheric pressure CSTR

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