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The pair in which phosphorous atoms have a formal oxidation state of +3 is

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The pair in which phosphorous atoms have a formal oxidation state of +3 is
A. orthophosphorous acid and pyrophosphorous acids
B. pyrophosphorous acid and hypophosphoric acids
C. orthophosphorous and hyphophosphoric acids
D. pyrophosphorus and pyrophosphoric acids
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Correct Answer - A
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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