Give the disproportionation reaction of `H_3PO_3`.
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On heating, orthophosphorus acid `(H_(3)PO_(3))` disproportionates to give orthophosphoric acid `(H_(3)PO_(4))` and phosphine `(PH_(3))`. The oxidation states of P in various species involved in the reaction are mentioned below.
`4H_(3) overset(+3)(PO_(3)) to 3H_(3)overset(+5)(PO_(4))+ overset(-3)(PH_(3))`