There is very little difference in acid strength in the series $H_3PO_4$,$H_3PO_3$,and $H_3PO_2$ because

  • A
    Phosphorus in these acids exists in different oxidation states
  • B
    The hydrogen in these acids are not all bonded to the phosphorus
  • C
    Phosphorus is not a highly electronegative element
  • D
    Phosphorus oxides are less basic

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Hypophosphorous acid is

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