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Why does H(3)PO(3) act as a reducing age...

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

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(a) Structure of phosphinic acid :
(b) `H_(3)PO_(2)` reduces `Ag^(+)` ions to Ag which shows its reducing nature.
`H_(3)PO_(2)+4AgNO_(3)+2H_(2)O to 4Ag +4HNO_(3) +H_(3)PO_(4)`
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Among H_(3)PO_(4) and H_(3)PO_(3) - H_(3)PO_(3) is reducing agent and dibasic H_(3)PO_(4) is reducing agent and dibasic H_(3)PO_(4) is reducing agent and tribasic H_(3)PO_(3) is reducing agent and tribasic

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