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Why molecularity is applicable only for elementary reactions and order is applicable for elementary as well as complex reactions?

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A complex proceeds through a number of elementary reactions. Number of molecules involved in each elementary reaction may be different i.e., the molecularity of each step may be different. Therefore, molecularity of overall complex reaction has no sense. On the other hand, order a complex reaction is determined by the slowest step in its mechanism and is valid even in the case of complex reactions.
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Knowledge Check

  • Molecularity of an elementary reaction

    A
    may be zero
    B
    is always integral
    C
    may be semi-integral
    D
    may be integral, fractional or zero

  • Molecularity of an elementary reaction

    A
    may be zero
    B
    is always integral
    C
    may be semi - integral
    D
    may be integral fractional or zero

  • Molecularity of an elementary reaction can be ______.

    A
    zero
    B
    natural number
    C
    fraction
    D
    negative

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