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What should be the order of acidic stren...

What should be the order of acidic strength in the series `H_(3)PO_(4)`, `H_(3)PO_(3)`, and `H_(3)PO_(2)`?

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The structure of these oxoacids of P are :

The reducing character of these oxoacids depends upon the number of P-H bonds. Since `H_(3)PO_(2)` has two, `H_(3)PO_(3)` has one and `H_(3)PO_(4)` has no P-H bonds, therefore, their recucing character decreases in the order : `H_(3)PO_(2)" "H_(3)PO_(3) gt H_(2) PO_(4)`
In fact, `H_(3)PO_(4)` does not act as a reducing agent.
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