1.

The species among the following, which can act as an acid and a base is

Answer»

`HSO_(4)^(-)`
`SO_(4)^(2-)`
`H_(3)O^(+)`
`Cl^(-)`

Solution :The SPECIES which cab accept as well as donate `H^(+)` can act both as an ACID and a base.
`underset("base")(HSO_(4)^(-)) + H^(+) hArr H_(2)SO_(4)`.
`underset("acid")(HSO_(4)^(-) hArr SO_(4)^(2-) + H^(+)`.


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