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Corrected Answer:

Three main members of the phophORUS acid group are: (protons are in bold capitals)

  • H3PO4; Phosphoric acid, PO(OH)3, tribasic acid, contains P in oxidation state +5
  • H3PO3; Phosphorous acid,HPO(OH)2, dibasic acid, contains P in oxidation state +3
  • H3PO2; Hypophosphorous acid, H2PO(OH), monobasic acid, contains P in oxidation state +1

There is only one diprotic: H3PO3.

When more structurally written as (HO)2HPOyou can see why it is diprotic: only from a P-(O-H) group the H can be ionised as H+ and can be donated as proton to a water molecule (acidic property). The H-P=O is NOT ionisable, thus not acidic.

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