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Give the disproportionation reaction of `H_3PO_3`.

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`H_3PO_3` on heating undergoes disproportionation i.e., self-oxidation-reduction to form `PH_3(O.S.ofP=-3)` and `H_3PO_4(O.S. of P=+5)`.
`H_3PO_3overset(Delta)toPH_3+H_2PO_4`
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