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  • Question
  • __________ explains the mechanism of catalysis.


  • Options
  • A. Activated complex theory
  • B. Collision theory
  • C. Thermodynamics
  • D. None of these

  • Correct Answer
  • Activated complex theory 


  • Chemical Reaction Engineering problems


    Search Results


    • 1. For a heterogeneous catalytic reaction

    • Options
    • A. free energy of activation is lowered in the presence of catalyst, which remains unchanged at the end of reaction.
    • B. a relatively small amount of catalyst can cause the conversion of large amount of reactants which does not mean that catalyst concentration is important.
    • C. the catalyst does not form an intermediate complex with the reactant.
    • D. the surface of the catalyst does not play an important role during reaction.
    • Discuss
    • 2. The rate constant of a chemical reaction decreases by decreasing the

    • Options
    • A. pressure
    • B. concentration of reactants
    • C. temperature
    • D. duration of reaction
    • Discuss
    • 3. In a consecutive reaction system when E1 is much greater than E2, the yield of B increases with the

    • Options
    • A. increase of temperature.
    • B. decrease of temperature.
    • C. increase in initial concentration of A.
    • D. decrease in initial concentration of A.
    • Discuss
    • 4. 'N' plug flow reactors in series with a total volume 'V' gives the same conversion as a single plug flow reactor of volume 'V' for __________ order reactions.

    • Options
    • A. first
    • B. second
    • C. third
    • D. any
    • Discuss
    • 5. From among the following, choose one which is not an exothermic process.

    • Options
    • A. Methanol synthesis
    • B. Catalytic cracking
    • C. Ammonia synthesis
    • D. Oxidation of sulphur
    • Discuss
    • 6. What is the order of a chemical reaction, , if the rate of formation of 'C', increases by a factor of 2.82 on doubling the concentration of 'A' and increases by a factor of 9 on trebling the concentration of 'B'?

    • Options
    • A. 7/2
    • B. 7/4
    • C. 5/2
    • D. 5/4
    • Discuss
    • 7. Pick out the correct statement.

    • Options
    • A. In catalytic reactions, the catalyst reacts with the reactants.
    • B. A catalyst initiates a chemical reaction.
    • C. A catalyst lowers the activation energy of the reacting molecules.
    • D. A catalyst can not be recovered chemi cally unchanged at the end of the chemical reaction.
    • Discuss
    • 8. The rate constant of a chemical reaction increases by 100 times when the temperature is increased from 400 °K to 500 °K. Assuming transition state theory is valid, the value of E/R is

    • Options
    • A. 8987°K
    • B. 9210°K
    • C. 8764°K
    • D. 8621°K
    • Discuss
    • 9. With decrease in temperature, the equilibrium conversion of a reversible endother-mic reaction

    • Options
    • A. decreases
    • B. increases
    • C. remains unaffected
    • D. increases linearly with temperature
    • Discuss
    • 10. A batch reactor is suitable for

    • Options
    • A. achieving cent percent conversion of reactants into products.
    • B. large scale gaseous phase reactions.
    • C. liquid phase reactions.
    • D. obtaining uniform polymerisation products in highly exothermic reactions.
    • Discuss


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