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NEET levelSingle correct optionDifficulty 1 of 3ia167

Which one of the following species can act both as a Bronsted acid and as a Bronsted base in water?

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

Answer: A

HPO X_{4} X^{2 -}

can donate a proton to give

PO X_{4} X^{3 -}

and can accept one to give

H X_{2} PO X_{4} X^{-}

, so it is amphiprotic.

PO X_{4} X^{3 -}

and

Cl X^{-}

can only accept a proton (or not at all), and

NH X_{4} X^{+}

can only donate.

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