Three reactions involving H2PO4− are given below: (i) H3PO4+H2O→H3O++H2PO4− (ii) H2PO4−+H2O→HPO42−+H3O+ (iii) H2PO4−+OH−→H3PO4+O2− In which of the above does H2PO4− act as an acid?
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