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JEE Main levelOne or more correct optionsDifficulty 2 of 3ia030

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

A $HPO X_{4} X^{2 -}$
B $NH X_{4} X^{+}$
C $HS X^{-}$
D $SO X_{4} X^{2 -}$

Answer: A, C

HPO X_{4} X^{2 -}

can give

PO X_{4} X^{3 -}

or accept to give

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

.

HS X^{-}

can give

S X^{2 -}

or accept to give

H X_{2} S

.

NH X_{4} X^{+}

only donates a proton, and

SO X_{4} X^{2 -}

is, in water, only a (very weak) base. Answer A and C.

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