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NEET levelSingle correct optionDifficulty 1 of 3ia021

Which of the following species is amphiprotic?

A $CO X_{3} X^{2 -}$
B $HCO X_{3} X^{-}$
C $NH X_{4} X^{+}$
D $Cl X^{-}$

Answer: B

An amphiprotic species can both donate and accept a proton.

HCO X_{3} X^{-}

can lose a proton to give

CO X_{3} X^{2 -}

and can gain one to give

H X_{2} CO X_{3}

.

CO X_{3} X^{2 -}

and

Cl X^{-}

only accept,

NH X_{4} X^{+}

only donates (in water).

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