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Oxidation number of fluorine in HOF compound

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MNIO:
Where on Earth did you get the idea that F was +1 in hypofluorous acid?

Oxidation state (number) is based entirely on electronegativities and assumes complete transfer of electrons.  It's not reality but an accounting term (as Borek mentioned) useful in balancing REDOX reactions. 
  EN H = 2.20
  EN O = 3.44
  EN F = 3.98

in HOF
  H = +1     (O with the higher EN gets an electron from H making H = +1)
  F = -1      (F with the higher EN takes an electron from O making F = -1
  O = 0       (O takes an electron and gives one away  or if you prefer,
                   overall HOF has 0 net charge   +1 (H) + x (O) - 1(F) = 0    x=0)

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