Assertion :In the reaction, $N O_{2} (g) + C O (g) ⟶ C O_{2} (g) + N O (g)$ , rate $= k {[N O_{2}]}^{2}$ .
The rate of reaction does not depend on the concentration of $C O$ . Reason: Carbon monoxide is involved in fast step.

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 A Both Assertion and Reason are correct and Reason is the correct explanation for Assertion
Rate= $k [N O_{2}]^{2}$
rate is obtained from the reactants in the slow step. Since the given rate does not depend on concentration of CO, it is possible that CO is involved in fast step and not in slow step.

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