Assertion : $O_{3}$ and ${N O}_{2}^{-}$ are isoelectronic. Reason: Bond angles of $O_{3}$ and ${N O}_{2}^{-}$ are ${116.8}^{o}$ and $115^{o}$ respectively.

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
Option (B) is correct.
The difference in bond angle is due to lone pair-bond pair repulsion in $O_{3}$ and lone electron-bond pair repulsion in ${N O}_{2}^{-}$ .

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