An oxyacid of sulphur contains $\mathrm{S}=\mathrm{S}$ linkage and the oxidation number of $\mathrm{S}$ in it is $+6$ and $-2$. It belongs to

The oxyacids of sulphur which contain $\mathrm{S}=\mathrm{S}$ linkage and oxidation number is $+6$ and $-2$ will be of –ic series.

For instance: Thiosulphuric acid

The structure of thiosulphuric acid will be,