The conjugate base of ${H O}^{-}$ is

O_{2}

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H_{2} O

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O^{-}

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O^{2 -}

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Solution

The correct option is D $O^{2 -}$
The concept of Conjugate Acid-Base pair was given by Lowry-Bronsted Theory.
According to the theory, acids are proton (H+) donors while bases are proton (H+) acceptors.
Hence, in order to get the conjugate base of a species, we should consider that substance as an acid and vice versa.

For example,
$H_{2} S O 4 \to H S O_{4}^{-} + H^{+}$
Therefore,
The conjugate base of $H_{2} S O_{4}$ is $H S O^{-}$

Hence, using this in the given example,
$O H^{-} ⟶ O^{2 -} + H^{+}$

So, the conjugate base of $O H^{-}$ is $O^{2 -}$ .

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