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What happens when H(3)PO(3) is heated?...

What happens when `H_(3)PO_(3)` is heated?

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The oxidation state of P in `H3P0 3 is +3 , which is the intermediate state between the highest ( +5) and the lowest (-3) oxidation states of P. Therefore, on heating, `H_(3)PO_(3)` undergoes disproportionation to form `PH_(3)` and `H_(3)PO_(4)` with oxidation states of - 3 and +5 , respectively.
`underset("Orthophosphorous acid")(4H_(3)overset(+3)(P)O_(3))overset("Heat")tounderset("Phosphine")(overset(-3)(P)H_(3))+underset("Orthophosphoric acid")(H_(3)overset(+5)(P)O_(4))`
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