The order of the oxidation state of the phosphorus atom in H3PO2, H3PO4, H3PO3 and H4P2O6 is
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H3PO2 H3PO4 H3PO3 H4P2O6
4(+1) + 2x + 6(–2) = 0
2x = 8 ⇒ x = + 4
H3PO4 > H4P2O6 > H3PO3 > H3PO2
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