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Chemical Engineering :: Chemical Reaction Engineering

  1. The rate constant of a chemical reaction increases by increasing the

  2. A.

     Temperature

    B.

     Pressure

    C.

     Reactant's concentration

    D.

     None of these


  3. Knudsen diffusion is directly proportional to

  4. A.

     T

    B.

     √T

    C.

     1/√T

    D.

     T₂


  5. Pure A in gas phase enters a reactor 50% of this A is converted to B through the reaction, A 3B. Mole fraction of A in the exit stream is

  6. A.

     1/2

    B.

     1/3

    C.

     1/4

    D.

     1/5


  7. For a solid catalysed chemical reaction, the effectiveness of solid catalyst depends upon the __________ adsorption.

  8. A.

     Physical

    B.

     Chemical

    C.

     Both A and B

    D.

     Neither A nor B


  9. When a catalyst increases the rate of forward reaction, the value of rate constant

  10. A.

     Increases

    B.

     Decreases

    C.

     Remain same

    D.

     Becomes infinite


  11. In the hydrodealkylation of toluene to benzene, the following reactions occur:
    C₇H₈ + H₂ → C₆H₆ + CH₄
    2C₆H₆ ⇋ C₁₂H₁₀ + H₂
    Toluene and hydrogen are fed to a reactor in a molar ratio 1:5.80% of the toluene gets converted and the selectivity of benzene(defined as moles of benzene formed/moles of toluene converted) is 90%. The fractional conversion of hydrogen is

  12. A.

     0.16

    B.

     0.144

    C.

     0.152

    D.

     0.136


  13. Half-life period for a first order reaction is __________ the initial concentration of the reactant.

  14. A.

     Directly proportional to

    B.

     Inversely proportional to

    C.

     Independent of

    D.

     None of these


  15. What is the order of a chemical reaction whose rate is deter-mined by the variation of one concentration term only?

  16. A.

     Zero

    B.

     First

    C.

     Second

    D.

     Third


  17. Which of the following curves shows the effect of temperature on the extent of gas-solid adsorption at a given pressure?

  18. A.

     Langmuir adsorption isotherm

    B.

     Adsorption isobar

    C.

     Freundlich adsorption isotherm

    D.

     None of these


  19. Transition state theory gives the rate constant as

  20. A.

     K α e-E/RT

    B.

     K α eE/RT

    C.

     K α T . e-E/RT

    D.

     K α √T . e-E/RT