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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.

  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

  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.

  7. In a chemical reaction, __________ are conserved.

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

  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.

  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.

  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.

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


  16. 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

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

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

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