H3PO2 and H3PO3 act as good reducing agents while H3PO4 does not.

In H3PO2 and H3PO3 , 2 hydrogen atoms and 1 hydrogen atom respectively are bonded to phoshorous atom. But in the case of H3 PO4 , there is no hydrogen atom bonded to phosphorous atom. So, it is not a reducing 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. Hence 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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