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JEE Main levelOne or more correct optionsDifficulty 2 of 3ie021

Which of the following species can act as both a Bronsted-Lowry acid and a Bronsted-Lowry base?

A $H X_{2} O$
B $HCO X_{3} X^{-}$
C $HS X^{-}$
D $ClO X_{4} X^{-}$

Answer: A, B, C

H X_{2} O

,

HCO X_{3} X^{-}

and

HS X^{-}

each carry a removable proton and a site that can accept one, so they are amphiprotic.

ClO X_{4} X^{-}

has no proton to donate and is only a (very weak) base.

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