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Three reactions involving H2PO4^- are gi...

Three reactions involving `H_2PO_4^-` are given below :
(P)`H_3PO_4+H_2O to H_3O^+ + H_2PO_4^(-)`
(Q)`H_2PO_4^(-) + H_2O to HPO_4^(2-)+H_3O^(+)`
(R) `H_2PO_4^(-)+OH^(-) to H_3PO_4 + O^(2-)`
In which of the above `H_2PO_4^(-)` acts as an acid ?

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