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

1. Orthophosphorous and pyrophosphorous acids
2. Pyrophosphorous and hypophosphoric acids
3. Orthophosphorous and hypophosphoric acids
4. Pyrophosphorous and pyrophosphoric acids Students may find similar question in CP exercise sheet : [ JEE Advance, Chapter : p-block elements, Key concept, Topic :- Oxyacids of phosphorus ]

Correct answer: Orthophosphorous and pyrophosphorous acids

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