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Account for the following : H3PO2 and ...

Account for the following :
`H_3PO_2` and `H_3PO_3` act as good reducing agents while `H_3PO_4` does not.

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Oxidation state of P in `H_3PO_2` is +1 , it can change to higher oxidation states +3 and +5 . Therefore , it can act as reducing agent . Oxidation state of P in `H_3PO_3` is +3 , it can change to higher oxidation state +5 . Therefore , it can act as reducing agent . Oxidation state of P in `H_3PO_4` is +5 . Therefore , it can act as reducing agent. oxidation state of P in `H_3PO_4` is +5 . It is the highest . Therefore , it cannot act as a reducing agent.
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H_(3)PO_(2) " and " H_(3)PO_(3) act as good reducing agents while H_(3)PO_(4) does not. Discuss.

Why does H_(3)PO_(3) act as a reducing agent but H_(3)PO_(4) does not ?

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