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Will the molecularity of a reaction be '...

Will the molecularity of a reaction be '2' if its overall order is 2?

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An elementary reaction with an order of '2' is a bimolecular reaction because the order and molecularity are the same for an elementary reaction. However, a reaction having an order of '2' does not always indicate that the reaction is a bimolecular one. If a reaction with an overall order of '2' involves multistep, then each step of the reaction will have its own molecularity. Hence, a reaction with an overall of order '2' may not have a molecularity of '2,
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Knowledge Check

  • Assertion (A) : The order and molecularity of the reaction is the same. Reason (R) : Order is determined experimentally. Molecularity is the sum of all the stoichiometric coefficients of the rate- determining elementary step.

    A
    (A) and (R) both are correct statements and (R) is correct explanation for (A).
    B
    (A) and (R) both are correct statements and (R) is not correct explanation for (A).
    C
    (A) is correct statement but (R) is wrong statement.
    D
    (A) is wrong statement but (R) is correct statement .

  • This question has Statement I and Statement II. Of four choices given after the Statements choose the one that best describes two statements Statement-I : in a multi-step reaction, the molecularity of overall reaction has no significance. Statement-II : Molecularity refers to the order of rate determining step.

    A
    Statement-I is true, Statement-II is true, Statement II is a correct explanation of Statement -I
    B
    Statement-I is true, Statement-II is true, Statement-II is not a correct explanation of Statement-I.
    C
    Statement-I is true, Statement-II is false
    D
    Statement-I is false, Statement-II is true.

  • This question has Statement I and Statement II. Of four choices given after the Statements choose the one that best describes two statements Statement I: The molecularity of the reaction H_2+Br_2rarr2 HBr is 2 Statement-II: The order of this reaction is 3/2.

    A
    Statement-I is true, Statement-II is true, Statement II is a correct explanation of Statement -I
    B
    Statement-I is true, Statement-II is true, Statement-II is not a correct explanation of Statement-I.
    C
    Statement-I is true, Statement-II is false
    D
    Statement-I is false, Statement-II is true.

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