It has two bonds and one lone pair the\[S-O)\] double bond arise from \[p\pi -d\pi \] bonding due to lateral overlap of \[p-\]orbitals of oxygen with \[d-\]orbitals of sulphur. The bond between \[S\] and \[O\] results from \[s{{p}^{2}}\] hybridization in \[S-\]atom.