The cyclotrimetaphosphoric acid is

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(B) Cyclotrimetaphosphoric acid has the formula $(HPO_3)_3$ or $H_3P_3O_6$.It consists of a cyclic structure with a $(P-O)_3$ ring.In the structure,th

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$H_3P_3O_6$ and contains $12\,\sigma$ bonds

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(B) Cyclotrimetaphosphoric acid has the formula $(HPO_3)_3$ or $H_3P_3O_6$.It consists of a cyclic structure with a $(P-O)_3$ ring.In the structure,there are $3$ $P-O$ bonds in the ring,$3$ $P=O$ bonds,$3$ $P-OH$ bonds,and $3$ $O-H$ bonds.Counting the $\sigma$ bonds: $3$ $(P-O)$ ring bonds + $3$ $(P-O)$ exocyclic bonds + $3$ $(O-H)$ bonds = $9$ $\sigma$ bonds from the framework,plus $3$ $\sigma$ bonds from the $P=O$ double bonds.Total $\sigma$ bonds = $3 + 3 + 3 + 3 = 12$ $\sigma$ bonds.

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