why H3PO3 act as reducing and oxidising agent
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In H3PO2 and H3PO3 oxidation state of P is +1 and +3 respectively, which can further be oxidized to a higher oxidation state. So they can act as reducing agents. In H3PO4 oxidation state of P is +5, which is highest for P. Hence H3PO4 cannot serve as a reducing agent.
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