Assertion :The superoxide $M O_{2}$ contains the paramagnetic ion $O_{2}^{-}$ . Reason: $O_{2}^{-}$ is stable in presence of large cations as $K, R b, C s .$

Read the above assertion and reason and choose the correct option regarding it.

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

$M O_{2}$ is paramagnetic due to $O_{2}^{-}$ , which has one unpaired electron so it is paramagnetic. MOT diagram is shown in the figure. As we move down the group its stability increases as size of the cation increase.

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