1.

Which one of the following speciesacts as both Bronsted acid and base ?

Answer»

`H_(2)PO_(2)^(-)`
`HPO_(3)^(2-)`
`HPO_(4)^(2-)`
All of these

Solution :`HPO_(4)^(2-) +H_(2)O IFF H_(2)PO_(4)^(-) +OH^(-)`
`HPO_(4)^(2-)+H_(2)O iff PO_(4)^(3-) +H_(3)O^(+)`
`H_(3)PO_(2)^(-)` is a conjugate BASE of `H_3PO_(2)` ( a monobasic acid ) and does not give `H^(+),HPO_(3)^(2-)` is conjugate base of `H_2PO_(3)^(-)` and does not ionise further , since `H_(3)PO_(3)` is a dibasic acid .


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