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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

  • (II) only

  • (I) and (II)

  • (III) only

  • (I) only

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