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Chemical Engineering :: Chemical Reaction Engineering

  1. A catalyst in a chemical reaction __________ free energy change in the reaction.

  2. A.

     Increases

    B.

     Decreases

    C.

     Either A or B; depends on the type of catalyst

    D.

     Neither A nor B


  3. The rate of a homogeneous reaction is a function of

  4. A.

     Temperature and pressure only

    B.

     Temperature and composition only

    C.

     Pressure and composition only

    D.

     All of the above


  5. Space time equals the mean residence time

  6. A.

     When the density of the reaction mixture is constant

    B.

     For large diameter tubular reactor

    C.

     For narrow diameter tubular reactor

    D.

     For CSTR


  7. An imbalanced chemical reaction equation is against the law of

  8. A.

     Multiple proportion

    B.

     Conservation of mass

    C.

     Constant proportion

    D.

     None of these


  9. Reverse reaction in a chemical equilibrium is favoured by the

  10. A.

     Removal of one of the products regularly

    B.

     Increase in the concentration of oneof the products

    C.

     Increase in the concentration of one of the reactants

    D.

     None of these


  11. For an isothermal second order aqueous phase reaction, A → B, the ratio of the time required for 90% conversion to the time required for 45% conversion is

  12. A.

     2

    B.

     4

    C.

     11

    D.

     22


  13. A batch adiabatic reactor at an initial temperature of 373°K is being used for the reaction, A → B. Assume the heat of reaction is - 1kJ/mole at 373°K and heat capacity of both A and B to be constant and equal to 50J/mole.K. The temperature rise after a conversion of 0.5 will be

  14. A.

     5°C

    B.

     10°C

    C.

     20°C

    D.

     100°C


  15. Carrier in a catalyst increases its

  16. A.

     Surface area

    B.

     Activity

    C.

     Performance

    D.

     None of these


  17. The dimensions of rate constant for reaction 3A → B are (l/gm mole)/min. Therefore the reaction order is

  18. A.

     0

    B.

     1

    C.

     2

    D.

     3


  19. Rate determining step in a reaction consisting of a number of steps in series is the __________ step.

  20. A.

     Fastest

    B.

     Slowest

    C.

     Intermediate

    D.

     Data insufficient; can't be predicted