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Chemical Engineering :: Chemical Reaction Engineering

  1. A catalyst in a chemical reaction

  2. A.
    decreases the activation energy.
    B.
    alters the reaction mechanism.
    C.
    increases the frequency of collisions of reacting species.
    D.
    all (a), (b) and (c).

  3. Slurry reactors are characterised by the

  4. A.
    lack of intraparticle diffusion resistance.
    B.
    presence of two mobile phases.
    C.
    both (a) and (b).
    D.
    neither (a) nor (b).

  5. Limiting reactant in a chemical reaction decides the

  6. A.
    rate constant
    B.
    conversion
    C.
    reaction speed
    D.
    equilibrium constant.

  7. Consider the 'n' th order irreversible liquid phase reaction A B. Which one of the following plots involving half life of the reaction (t1/2) and the initial reactant concentration (CA0) gives a straight line plot ?

  8. A.
    CA0 Vs t1/2
    B.
    ln CA0 Vs t1/2
    C.
    CA0 Vs ln t1/2
    D.
    ln CA0 Vs ln t1/2

  9. The rate of forward reaction, at chemical equilibrium is____the rate of backward reaction.

  10. A.
    more than
    B.
    less than
    C.
    equal to
    D.
    either (b) or (c)

  11. Pick the WRONG design guideline for a reactor in which the reactions, A R (desired) and A S (undesired) are to take place. The ratio of the reaction rates is .

  12. A.
    use high pressure and eliminate inerts, when a > b.
    B.
    avoid recycle, when a > b.
    C.
    use batch reactor or plug flow reactor, when a > b.
    D.
    use CSTR with a high conversion, when a > b.

  13. With increase in temperature, the equilibrium __________ rises in case of endothermic reaction.

  14. A.
    constant
    B.
    conversion
    C.
    both (a) & (b)
    D.
    neither (a) nor (b)

  15. In case of a consecutive unimolecular type first order reaction , the concentration of component __________ increases continuously with time.

  16. A.
    S
    B.
    R
    C.
    A
    D.
    none of these

  17. Enzymes (a protein) are catalysts found in organisms. Its efficiency of catalysing a reaction is due to its capacity to lower the activation energy of the reaction. The enzyme ptyalin used for food digestion is present in

  18. A.
    blood
    B.
    saliva
    C.
    intestine
    D.
    gland

  19. Considering the endotheomic dissociation of CaCO3 in a closed vessel (CaCO3 CaO + CO2), the pressure of CO2 increases, if

  20. A.
    a catalyst is added.
    B.
    the temperature is increased.
    C.
    an inert gas is pumped keeping the temperature constant.
    D.
    none of these.