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Correct conjugate acid for H2O and corre...

Correct conjugate acid for `H_2O` and correct conjugate base for `H_2PO_4^-` are
(1) `OH^-` and `H_3PO_4`
(2) `H_3O^+` and `H_3PO_4`
(3) `H_3O^+` and `HPO_4^(2-)`
(4) `OH^-` and `HPO_4^(2-)`

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