The conjugate acid of $O^{2 -}$ ions is:

O_{2}^{+}

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H^{+}

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H_{3} O^{+}

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O H^{-}

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Solution

The correct option is D $O_{2}^{+}$
$O H^{-}$ is the conjugate acid of the base $O_{2}^{-}$ is also conjugate base of the acid $H^{2} O$ . According to bronsted -laury theory of acids and bases, a base is the one which accepts a proton. i.e, $H^{+}$ and forms a corresponding conjugate acid.
Option (B) is correct answer

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