Which one of the following species acts as both Bronsted acid and base ?A. `H_(2)PO_(2)^(-)`B. `HPO_(3)^(2-)`C. `HPO_(4)^(2-)`D. All of these

Which one of the following species acts as both Bronsted acid and base

1.	Which one of the following species acts as both Bronsted acid and base ?A. `H_(2)PO_(2)^(-)`B. `HPO_(3)^(2-)`C. `HPO_(4)^(2-)`D. All of these
Answer» Correct Answer - C `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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