Which one of the following species cannot act as both Bronsted acid and base?

H_{2} O

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H C O_{3}^{-}

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H S O_{4}^{-}

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N H_{2}^{-}

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N H_{3}

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Solution

The correct option is E $N H_{2}^{-}$
${N H_{2}}^{-}$ , Because it does not have any conjugate acid nor any conjugate base.
Others have the same like:
Species C.A. C.B.
$H_{2} O$ $H_{3} O^{+}$ $O H^{-}$
${H C O_{3}}^{-}$ $H_{2} C O_{3}$ ${C O_{3}}^{2 -}$
${H S O_{4}}^{-}$ $H_{2} S O_{4}$ ${S O_{4}}^{2 -}$
$N H_{3}$ ${N H_{4}}^{+}$ ${N H_{2}}^{-}$

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