Molecularity of a reaction is defined by -

Slowest step

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Reversible step

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From overall reaction

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Fastest step

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Solution

The correct option is D Slowest step
The molecularity and rate of the reaction are determined by the slow step.

So the slow step is:
$O_{3} + O \to 2 O_{2}$ (Slow step).

Hence option A is correct.

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Similar questions

For a complex reaction ......... .

(a) order of overall reaction is same as molecularity of the slowest step
(b) order of overall reaction is less than the molecularity of the slowest step
(c) order of overall reaction is greater than molecularity of the slowest step
(d) molecularity of the slowest step is never zero or non-integer

Q. Assertion :Molecularity greater than three is not observed. Reason: The overall molecularity of a complex reaction is equal to molecularity of the slowest step.

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