Which of the following species can act both as an acid as well as base?

S O_{4}^{2 -}

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H S O_{4}^{-}

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P O_{4}^{3 -}

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O H^{-}

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Solution

The correct option is B $H S O_{4}^{-}$
$H_{2} S O_{4} H_{2} O \to H S O_{4}^{-} + H^{+}$

$H S O_{4}^{-} H_{2} O \to S O_{4}^{2 -} + H^{+}$

$H S O_{4}^{-}$ in intermediate state can act as both acid and base.

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