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