Home / Chemical Engineering / Chemical Reaction Engineering :: Section 4

Chemical Engineering :: Chemical Reaction Engineering

  1. Photochemical reaction rate does not depend significantly on temperature, because

  2. A.
    it is a reversible reaction.
    B.
    it is an exothermic reaction.
    C.
    the energy of reacting molecules exceeds the activation energy by absorption of light.
    D.
    none of these.

    View Answer

    Workspace

    Discuss Discuss in Forum


  3. A CSTR is to be designed in which an exothermic liquid phase first order reaction of the type, A R, is taking place. The reactor is to be provided with a jacket in which coolant is flowing. Following data is given: CA0= 5 kmole/m3 ; XA = 0.5; Feed temperature = reactor temperature = 40°C. Rate constant at 40°C = 1 min-1 ; (ΔH) = - 40kJ/mole; ρ = 1000kg/m3 CP = 4 J/gm.°C ; q = 10-3 m3/min (ρ and CP are same for the reactant and product streams). The amount of heat to be removed is

  4. A.
    2/3 kW
    B.
    1kW
    C.
    5/3 kW
    D.
    4kW

    View Answer

    Workspace

    Discuss Discuss in Forum


  5. According to the 'law of mass action', the rate of reaction is directly proportional to the

  6. A.
    equilibrium constant.
    B.
    volume of the reaction vessel.
    C.
    nature of the reactants.
    D.
    molar concentration of the reactants.

    View Answer

    Workspace

    Discuss Discuss in Forum


  7. In a chemical reaction, __________ are conserved.

  8. A.
    ions
    B.
    masses
    C.
    atoms
    D.
    both(b) & (c)

    View Answer

    Workspace

    Discuss Discuss in Forum


  9. For an ideal gas mixture undergoing a reversible gaseous phase chemical reaction, the equilibrium constant

  10. A.
    is independent of pressure.
    B.
    increases with pressure.
    C.
    decreases with pressure.
    D.
    increases /decreases with pressure depending on the stoichiometric co-efficients of the reaction.

    View Answer

    Workspace

    Discuss Discuss in Forum


  11. In the reversible reaction of the type, A + B AB, in general

  12. A.
    both forward and backward reactions will be exothermic.
    B.
    neither of the reactions will be en-dothermic.
    C.
    the combination reaction will be exothermic, while the dissociation reaction will be endothermic.
    D.
    the combination reaction will be endothermic, while the dissociation reaction will be exothermic.

    View Answer

    Workspace

    Discuss Discuss in Forum


  13. A batch reactor is

  14. A.
    suitable for gas-phase reactions on commercial scale.
    B.
    suitable for liquid phase reactions involving small production rate.
    C.
    least expensive to operate for a given rate.
    D.
    most suitable for very large production rate.

    View Answer

    Workspace

    Discuss Discuss in Forum


  15. For a first order reaction carried out in a plug flow reactor, the space time is

  16. View Answer

    Workspace

    Discuss Discuss in Forum


  17. For an isothermal second order aqueous phase reaction, A B, the ratio of the time required for 90% conversion to the time required for 45% conversion is

  18. A.
    2
    B.
    4
    C.
    11
    D.
    22

    View Answer

    Workspace

    Discuss Discuss in Forum


  19. A chemical reaction is of zero order, when the reaction rate is (where, CA = concentration of reactant)

  20. A.
    CA.
    B.
    ∝ 1/CA.
    C.
    independent of temperature.
    D.
    none of these.

    View Answer

    Workspace

    Discuss Discuss in Forum