Which of the following statements is not valid for oxoacids of phosphorus?

  • A
    All oxoacids contain tetrahedral four-coordinated phosphorus.
  • B
    All oxoacids contain at least one $P=O$ unit and one $P-OH$ group.
  • C
    Orthophosphoric acid is used in the manufacture of triple superphosphate.
  • D
    Hypophosphorous acid is a diprotic acid.

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