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Chemical Engineering :: Chemical Reaction Engineering

  1. The order of a chemical reaction is

  2. A.

     An experimentally determined quantity

    B.

     Always equal to the total stoichiometric number of reactants

    C.

     Never fractional

    D.

     None of these


  3. With increase in initial concentration, the fractional conversion of a first order reaction in a given time

  4. A.

     Increases

    B.

     Decreases

    C.

     Remains constant

    D.

     Unpredictable


  5. Pick out the wrong statement:

  6. A.

     Chemical reactions with high activation energy are very temperature sensitive

    B.

     A flat velocity profile exists in a plug flow reactor

    C.

     The residence time for all the elements of fluid in case of a P.F.R. need not be same

    D.

     Half life of a reaction increases with increased initial concentration for reaction orders more than one


  7. The rate of the heterogenous catalytic reaction A(g) + B(g) ? C(g) is given by -rA = k.KA.pA.PB/(1 + KA.PA + Kc.pc), where KA and Kc are the adsorption equilibrium constants. The rate controlling step for this reaction isA. absorption of A.

  8. A.

     Absorption of A

    B.

     Surface reaction between absorbed A and absorbed B

    C.

     Surface reaction between absorbed A and B in the gas phase

    D.

     Surface reaction between A in the gas phase and absorbed B


  9. The knowledge of initial concentration and rate constant is necessary to determine the half life time of a reaction of __________ order.

  10. A.

     Zero

    B.

     First

    C.

     Second

    D.

     None of these


  11. The irreversible reaction, X → Y, is the special case of the reversible reaction, X ⇋ Y, in which the

  12. A.

     Equilibrium constant is infinite

    B.

     Fractional conversion of

    C.

     Concentration of

    D.

     All of the above


  13. Photo-chemical reactions occur in presence of

  14. A.

     Sunlight

    B.

     Darkness

    C.

     Solid catalysts

    D.

     Monochromatic radiation only


  15. In an ideal mixed reactor (at steady state), the

  16. A.

     Space time is equivalent to holding time for constant density systems

    B.

     Composition throughout the reactor remains same

    C.

     Exit stream has the same composition as the fluid within the reactor

    D.

     All of the above


  17. An endothermic aqueous phase first order irreversible reaction is carried out in an adiabatic plug flow reactor. The rate of reaction

  18. A.

     Is maximum at the inlet of the reactor

    B.

     Goes through a maximum along the length of the reactor

    C.

     Goes through a minimum along the length of the reactor

    D.

     Is maximum at the exit of the reactor


  19. The synthesis of proteins and metabolism in biological objects occur in the presence of biocatalyst called

  20. A.

     A ferment or an enzyme

    B.

     Haemoglobin

    C.

     Fungi

    D.

     None of these