Which of the following species can act both as Bronsted acid and base?
(I) $N H_{2}^{-}$ (II) $H C O_{3}^{-}$ (III) $A l C l_{3}$ (IV)All of these

(I), (II)

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(II), (III)

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(II), (IV)

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(III), (IV)

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Solution

The correct option is C (II), (IV)
Those species can act both as Bronsted acid and base which can donate and accept H⁺ ions.

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