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  4. Among CO23, OH- , NH3 and HCO-3, the species that acts as a Bronsted acid as well as a Bronsted base, is

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Q. Among $CO^2_3, OH^{-} , NH_3$ and $HCO^{-}_3$, the species that acts as a Bronsted acid as well as a Bronsted base, is

KVPYKVPY 2009

Solution:

Bronsted acid is that species that can donate $H^+$ ions and Bronsted base is one that can accept $H^+$ ions.
Thus, the species that acts as a Bronsted acid as well as a Bronsted base is $NH_3$.
$NH_3 + NH_3{\rightleftharpoons} NH^{+}_4 + NH^{-}_2$
Such, species are known as amphoteric species.