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Give one disproportionation reaction of ...

Give one disproportionation reaction of phosphorus acid `(H_(3)PO_(3))`.

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Upon heating to about 573 K, phosphorus acid undergoes disportionation as follows :
`underset("Phosphorus acid")(4H_(3)overset(+3)PO_(3)) overset(573 K) to underset("Phosphoric acid")(3H_(3)overset(+5)PO_(4)+overset(-3)PH_(3))`
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