Which of the following species act both as an acid as well as a 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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N H_{3}

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Solution

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

$H S O_{4}^{-} ⇋ S O_{4}^{2 -} + H^{+}$

Species which can accept as well as donate $H^{+}$ ion can act both as acid and base.

Option B is corrrect.

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The species: H₂O,, and NH₃ can act both as Brönsted acids and bases. For each case give the corresponding conjugate acid and base.

{N H}_{3}, {H S O}_{4}^{-}, H_{2} {S O}_{4}, {H C O}_{3}^{-}, H_{3} O

The species that can act both as a Bronsted acid as well as a base?

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