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Phosphorus forms a number of oxoacids which differ in their structures and oxidation state of phosphorus. All the acids contain phosphorus atom//atoms linked tetrahedrally to four other atoms or groups. Each of them has at least one `P=O` or `P rarr O` unit and one `P-OH` unit. The `OH` group is ionisable but `H` atom linked directly to `P` is non-ionisabl. Structures of all the acids are considered to be derived either from phosphorus acid or phosphoric acid. Which of the following is a cycle oxoacid ?A. `H_(4)P_(2)O_(7)`B. `H_(4)P_(2)O_(6)`C. `H_(3)P_(3)O_(9)`D. `H_(5)P_(5)O_(9)`

Answer» Correct Answer - C
Orthophosphoric acid: `H_(3)PO_(4)`
Hypophosphoric acid: `H_(4)P_(2)O_(6)`


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