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

1. Orthophosphorous and hypophosphoric acids
2. Pyrophosphorous and pyrophosphoric acids
3. Orthophosphorous and pyrophosphorous acids
4. Pyrophosphorous and hypophosphorous acids

Correct answer: Orthophosphorous and pyrophosphorous acids

Solution

Orthophosphorous and pyrophosphorous acids both contain phosphorus in a +3 oxidation state, as indicated by their chemical structures and the way phosphorus is bonded in these compounds.

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