Paragraph: In oxoacids of phosphorus, P is tetrahedrally surrounded by other atoms. All these acids contain one P = O and P - OH bond. The oxoacids in which phosphorus has lower oxidation state (less than +5 ) contain, in addition to P = O

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Paragraph: In oxoacids of phosphorus, P is tetrahedrally surrounded by other atoms. All these acids contain one P = O and P - OH bond. The oxoacids in which phosphorus has lower oxidation state (less than +5 ) contain, in addition to P = O and P - OH bonds, either P - P (e.g., in H ₄ P ₂ O ₆ ) or P - H (e.g., in . H ₃ PO ₂ ) bonds but not both. These acids in +3 oxidation state of phosphorus tend to disproportionate

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Correct answer: 3

H ₄ P ₂ O ₇ (pyrophosphoric acid) is a tetrabasic acid, i.e. 4-hydroxyl groups are present. It is prepared by removing one water molecule from two molecules of orthophosphoric acid. Each phosphorus atom lies in same tetrahedral environment, so called isopolyacid.

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