The pair in which phosphorous atoms have a formal oxidation state of +

1.	The pair in which phosphorous atoms have a formal oxidation state of +3 is
Answer» orthophosphorous acid and pyrophosphorous acids pyrophosphorous acid and hypophosphoric acids orthophosphorous and hyphophosphoric acids pyrophosphorus and pyrophosphoric acids Solution :The O. S of P is given in the BRACKET. Orthophoshorus acid, `H_(3)PO_(3)(+3)`, Pyrophosphorus acid, `H_(4)P_(2)O_(5)(+3)`, Hypophosphoric aicd, `H_(4)P_(2)O_(6)+(4)` and Pyrophosphoric acid, `H_(4)P_(2)O_(7)(+5)`.

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