Assertion -The molecularity of the reaction H2 - Br2 - 2HBr is 2- Reason- The order of the reaction is 3-2-

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Standard XII

Chemistry

Order of Reaction

Assertion :Th...

Question

Assertion :The molecularity of the reaction $H_{2} + B r_{2} \to 2 H B r$ is 2. Reason: The order of the reaction is 3/2.

Both Assertion and Reason are correct and Reason is the correct explanation for Assertion

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Both Assertion and Reason are correct but Reason is not the correct explanation for Assertion

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Assertion is correct but Reason is incorrect

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Assertion is incorrect but Reason is correct

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Solution

The correct option is B Both Assertion and Reason are correct but Reason is not the correct explanation for Assertion
The molecularity of the reaction $H_{2} + B r_{2} \to 2 H B r$ is 2 because two molecules of the reactants are involved in the given elementary reactions.
The order of the reaction is $\frac{3}{2}$ and it is determined experimentally.
Hence, both Assertion and Reason are correct but Reason is not the correct explanation for Assertion.

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Assertion (A) Order of the reaction can be zero or fractional.

Reason (R) We cannot determine order from balanced chemical equation.

(a) Both assertion and reason are correct and the reason is correct explanation of assertion
(b) Both assertion and reason are correct, but reason does not explain assertion.
(c) Assertion is correct, but reason is incorrect
(d) Both assertion and reason are incorrect
(e) Assertion is incorrect but reason is correct.

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Reason (R) Order is determined experimentally and molecularity is the sum of the stoichimetric coeffcient of rate determining elementary step.

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