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Chemical Engineering :: Chemical Reaction Engineering

  1. Enzymes are destroyed, when the

  2. A.

     Temperature is very high

    B.

     Reactant's concentration is very high

    C.

     Reactant's concentration is very low

    D.

     Reaction rate is independent of the reactant's concentration


  3. A catalyst is said to be a negative catalyst, ifit

  4. A.

     Retards the rate of reaction

    B.

     Reduces the value of equilibrium constant

    C.

     Does not initiate the reaction

    D.

     All of the above


  5. For a zero order chemical reaction, the

  6. A.

     Half life period is directly proportion to the initial concentration of the reac-tants

    B.

     Plot of products concentration with time is a straight line through the origin

    C.

     Products concentration increases linerarly with time

    D.

     All of the above


  7. The equilibrium constant of a catalytic chemical reaction __________ due to the presence of a catalyst.

  8. A.

     Increases

    B.

     Decreases

    C.

     Remains unaffected

    D.

     Unpredictable from the data


  9. From Arhenius law, a plot of loge K versus 1/T gives a straight line with a slope of (-E/R). The unit of E/R is

  10. A.

     K cal

    B.

     K cal/°K

    C.

     °K

    D.

     K cal. °K


  11. Which of the following factors control the deactivation of a porous catalyst pellet?

  12. A.

     Decay reactions

    B.

     Pore diffusion

    C.

     Form of surface attack by poison

    D.

     All of the above


  13. Velocity of a reaction depends upon the

  14. A.

     Nature of the reactants

    B.

     Concentration of the reactants

    C.

     Temperature at which the reaction is carried

    D.

     All of the above


  15. Inversion of cane sugar is an example of

  16. A.

     Unimolecular reaction with first order

    B.

     Bimolecular reaction with second order

    C.

     Bimolecular reaction with first order

    D.

     Unimolecular reaction with second order


  17. Most important characteristics of gas-liquid reactors are the

  18. A.

     Specific inter-facial area

    B.

     Liquid hold-up

    C.

     Both A and B

    D.

     None of these


  19. The enzyme which can catalyse the conversion of glucose to ethyl alcohol is

  20. A.

     Invertase

    B.

     Maltase

    C.

     Diastase

    D.

     Zymase