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Chemical Engineering :: Chemical Reaction Engineering

  1. Threshold energy in a reaction is equal to the

  2. A.

     Activation energy

    B.

     Normal energy of reactants

    C.

     Sum of A & B

    D.

     Neither A nor B

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  3. In case of calcination of limestone, CaCO₃ CaO + CO₂, the addition of more of CaO will result in __________ in the concentration of CO₂.

  4. A.

     No change

    B.

     Increase

    C.

     Decrease

    D.

     Unpredictable from the data

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  5. The equilibrium constant of chemical reaction __________ in the presence of catalyst.

  6. A.

     Increases

    B.

     Decreases

    C.

     Remains unaffected

    D.

     Can either increase or decrease (depends on the type of catalyst)

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  7. From among the following, choose one which is not an exothermic process.

  8. A.

     Methanol synthesis

    B.

     Catalytic cracking

    C.

     Ammonia synthesis

    D.

     Oxidation of sulphur

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  9. If a solid-gas non-catalytic reaction occurs at very high temperature, the rate controlling step is the __________ diffusion.

  10. A.

     Film

    B.

     Ash layer

    C.

     Pore

    D.

     None of these

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  11. The rate constant of a chemical reaction increases by 100 times when the temperature is increased from 400 °K to 500 °K. Assuming transition state theory is valid, the value of E/R is

  12. A.

     8987°K

    B.

     9210°K

    C.

     8764°K

    D.

     8621°K

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  13. Find a mechanism that is consistent with the rate equation and reaction given below: 2A + B → A₂B, ( - rA) = k.CA.CB

  14. A.

     A + B ⇋ AB ; AB + A → A₂B

    B.

     A + B ⇋ AB;AB + A → A₂B

    C.

     A + A ⇋ AA;AA + B → A₂B

    D.

     A + A ⇋ AA;AA + B → A₂B

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  15. At a given temperature, K₁, K₂ and K3 are equilibrium constants for the following reactions 1, 2, 3 respectively.
    CH₄(g) + H₂O(g) ⇋ CO(g) + 3H₂(g),
    CO(g) + H₂O(g) ⇋ CO₂(g) + H₂(g)
    CH₄(g) + 2H₂O(g) ⇋ CO₂(g) + 4H₂(g)
    Then K₁, K₂ and K3 are related as:

  16. A.

     K3 = K₁.K₂

    B.

     K3 = (K₁.K₂)0.5

    C.

     K3(K₁+K₂)/2

    D.

     K3 = (K₁.K₂)2

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  17. The catalytic activity of enzymes is due to their capacity to lower the __________ energy.

  18. A.

     Activation

    B.

     Potential

    C.

     Kinetic

    D.

     None of these

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  19. For a fluidised bed reactor, the most suitable/relevant model is a __________ model.

  20. A.

     Tank in series

    B.

     Bubbling bed

    C.

     Plug flow

    D.

     None of these

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