Peroxide and superoxide ions are, respectively:

diamagnetic and diamagnetic

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paramagnetic and paramagnetic

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paramagnetic and diamagnetic

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diamagnetic and paramagnetic

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Solution

The correct option is C diamagnetic and paramagnetic
Peroxide and superoxide ions are diamagnetic and paramagnetic respectively.
The superoxide ion ( $O_{2}^{-}$ ) will have one unpaired electron and therefore will be paramagnetic, while peroxide ion ( $O_{2}^{2 -}$ ) doesn't have any unpaired electrons and is diamagnetic.

Hence, the correct option is $D$

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