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Chemical Engineering :: Chemical Reaction Engineering

  1. The conversion for a first order liquid phase reaction. A B in a CSTR is 50%. If another CSTR of the same volume is connected in series, then the % conversion at the exit of the second reactor will be

  2. A.
    60
    B.
    75
    C.
    90
    D.
    100

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  3. Rate of a chemical reaction is independent of the concentration of the reactants for a __________ reaction.

  4. A.
    zero order
    B.
    third order
    C.
    consecutive
    D.
    none of these

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  5. With increase in temperature, the rate constant obeying Arhenious equation

  6. A.
    increases.
    B.
    decreases.
    C.
    decreases exponentially.
    D.
    can either increase or decrease ; depends on the frequency factor.

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  7. Bulk diffusion in catalyst pore __________ with increase in pressure.

  8. A.
    increases
    B.
    decreases
    C.
    remains unchanged
    D.
    increases exponentially

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  9. Pick out the correct statement.

  10. A.
    A chemical reaction accompanied by absorption of heat is called an exothermic reaction.
    B.
    A chemical reaction accompanied by evolution of heat is called an endother-mic reaction.
    C.
    The rate constant for a first order reaction does not change on changing the concentration units.
    D.
    Chemical equilibrium state is dynamic in nature.

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  11. The concentration of A in a first order reaction, A B, decreases

  12. A.
    linearly with time.
    B.
    exponentially with time.
    C.
    very abruptly towards the end of the reaction.
    D.
    logarithmically with time.

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

  14. A.
    increases
    B.
    decreases
    C.
    remains unaffected
    D.
    can either increase or decrease (depends on the type of catalyst)

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  15. The order of a chemical reaction is

  16. A.
    an experimentally determined quantity.
    B.
    always equal to the total stoichiometric number of reactants.
    C.
    never fractional.
    D.
    none of these.

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  17. A chemical reaction occurs, when the energy of the reacting molecules is __________ the activation energy of reaction.

  18. A.
    less than
    B.
    equal to
    C.
    more than
    D.
    equal to or more than

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  19. 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

  20. A.
    0.16
    B.
    0.144
    C.
    0.152
    D.
    0.136

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