Which of the following is/are amphiprotic

$H C O_{3}^{-}$

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$H_{2} P O_{3}^{-}$

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$C H_{3} C O O^{-}$

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$O H^{-}$

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Solution

The correct options are
A
$H C O_{3}^{-}$

B
$H_{2} P O_{3}^{-}$

Amphiprotic are those, which can accept as well as donate $H^{+}$
$C O_{3}^{2 -} - H^{+} \leftarrow H C O_{3}^{-} + H^{+} \to H_{2} C O_{3} H P O_{3}^{2 -} - H^{+} \leftarrow H_{2} P O_{3}^{-} + H^{+} \to H_{3} P O_{3} C H_{3} C O O^{-} a n d O H^{-} c a n a c c e p t H^{+}$

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K_{1}

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N H_{3} + N H_{3} ⇌ N H_{4}^{+} + {N H_{2}}^{-}

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