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

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HSO4-

SO42-

H3O+

Cl-

answer is A.

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Detailed Solution

The species which can accept as well as donate H+ can act both as an acid and as a base.HSO4-base + H+⇌ H2SO4HSO4-acid ⇌ SO42-+ H+

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