4 2 6 | | || || OH OH HO P P OH O O H P O Hypophosphoric acid 4 3 5 H PO Pyropophosphoric acid P H H OH O (H₃PO₂) P H HO OH O (H₃PO₃) P OH HO OH O (H₃PO₄) HO OH OH H H O P P O O Dibasic acid reducing Hypophosphorus acid monobasic reducing O P OH O Monobasic Non- reducing O P-BLOCK ELEMENTS (GROUP 15-18) 10 3 HPO Metapophosphoric acid
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