Question 6

Structures of the oxoacids of phosphorus: - **H₃PO₄ (orthophosphoric acid)**: P bonded to three OH groups and one =O; no P–H bond. - **H₃PO₃ (phosphorous acid)**: P bonded to two OH groups, one =O, and one H directly → one P–H bond (hence dibasic). - **H₄P₂O₇ (pyrophosphoric acid)**: two PO₄ tetrahedra sharing an oxygen bridge; each P has two OH and one =O; no P–H bond. - **H₃PO₂ (hypophosphorous acid)**: P bonded to one OH, one =O, and two H atoms → two P–H bonds (hence monobasic). Thus the compounds with P–H bonds are H₃PO₃ and H₃PO₂.

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