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Assertion (A) Order and molecularity are...

Assertion (A) Order and molecularity are same.
Reason (R) Order is determined experimentally and molecularity is the sum of the stoichiometric coefficient of rate determining elementary step.

A

Both assertion and reason are correct and the reason is correct explananation of assertion.

B

Both assertion and reason are correct but reason does not explain assertion.

C

Assertion is correct but reason is incorrect.

D

Assertion is incorrect but reason is correct.

Text Solution

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Correct Assertion. Order may or may not be equal to molecularity.
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Assertion: Order and molecularity are same. Reason: Order is determined experimentally and molecularity is the sun of the stoichiometric coefficient of determining elementary step.

(i) Distinguish between order and molecularity of a reaction. (ii) when would order and molecularity of a reaction be the same?

Knowledge Check

  • Assertion (A): For complex reactions molecularity and order are not same. Reason (R): Order of reaction may be zero.

    A
    Both A and R are true and R is the correct explanation for A
    B
    Both A and R are true but R is NOT the correct explanation of A
    C
    A is true but R is false
    D
    A is false and R is true

  • Assertion (A) : The order of a reaction can be fractional but molecularity is never fractional. Reason (R ): The order of reaction does not depend upon the stoichiometric coefficients of a balanced equation.

    A
    If both `(A)` and `(R )` are correct, and `(R )` is the correct explnation of `(A)`.
    B
    If both `(A)` and `(R )` are correct, but `(R )` is noth the correct explanation of `(A)`.
    C
    If `(A)` is correct, but `(R )` is incorrect.
    D
    If `(A)` is incorrect, but `(R )` is correct.

  • Assertion. Order of a reaction can be fractional but molecularity is never fractional. Reason. Order of reaction does not depend upon the stoichiometric coefficients of the balanced equation.

    A
    If both assertion and reason are true and reason is the true explanation of the assertion.
    B
    If both assertion and reason ae true but reason is not the true explanation of the assertion.
    C
    If assertion is true, but reason is false.
    D
    If both assertion and reason are false.

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    Assertion (A) : Molecularity of inversion of sugar is one The order of this reaction is one.

    Assertion: Order and molecularity of a reaction are always equal. Reason: Complex reactions take place in steps and slowest step determines the reaction order.

    Assertion (A) Order of the reaction can be zero or fractional. Reason (R) We cannot determine order from balanced chemical equation.

    Assertion (A) : For the reaction H_(2)+I_(2) hArr 2HI, K_(p)=K_(c) Reason (R) : In this reaction, the sum of stoichiometric coefficient of reactants is equal to the sum of stoichiometric coefficients of products.

    Which of the following statemen is /are correct about order of a reaction? I. The order of a reaction can be a fractional number. II. Order of a reaction is experimentally determined quantity. III. The order of a reaction is always equal to the sum of the stoichimetric coefficients of reactants in the balanced chemical equation for a reaction. IV. The order of a reaction is the sum of the powers of molar concentration of the reactants in the rate law expression. Choose the correct option.

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