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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


  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


  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


  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


  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


  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


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

  14. A.

     1

    B.

     0

    C.

     ∞

    D.

     Between 0 and 1


  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


  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


  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