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  • Question
  • If the time required to complete a definite fraction of reaction varies inversely as the concentration of the reactants, then the order of reaction is


  • Options
  • A. 0
  • B. 1
  • C. 2
  • D. 3

  • Correct Answer



  • Chemical Reaction Engineering problems


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    • 1. The dimensions of rate constant for reaction 3AB are (l/gm mole)/min. Therefore the reaction order is

    • Options
    • A. 0
    • B. 1
    • C. 2
    • D. 3
    • Discuss
    • 2. 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
    • 3. 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
    • 4. 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
    • 5. 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
    • 6. The reason why a catalyst increases the rate of reaction is that, it

    • Options
    • A. decreases the energy barrier for reaction.
    • B. increases the activation energy.
    • C. decreases the molecular collision diameter.
    • D. none of these.
    • Discuss
    • 7. For a zero order chemical reaction, the

    • Options
    • A. half life period is directly proportion to the initial concentration of the reac-tants.
    • B. plot of products concentration with time is a straight line through the origin.
    • C. products concentration increases linerarly with time.
    • D. all (a), (b) and (c).
    • Discuss
    • 8. A catalyst loses its activity due to

    • Options
    • A. loss in surface area of the active component.
    • B. agglomeration of metal particles caused by thermal sintering of the solid surface.
    • C. covering of the catalytic active sites by a foregin substance.
    • D. all (a), (b) and (c).
    • Discuss
    • 9. For an isothermal variable volume batch reactor, the following relation is applicable for a first order irreversible reaction.

    • Options
    • A. XA = k . t
    • B.
    • C. -ln(1 - XA) = kt
    • D. ?A . ln (1 - XA) = k . t
    • Discuss
    • 10. Radioactive decay follows __________ order kinetics.

    • Options
    • A. first
    • B. second
    • C. third
    • D. zero.
    • Discuss


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