In which pair of ions both the species contain $\text{S}-\text{S}$ bond?

- ${\text{S}}_2{\text{O}}_3^{2-}$ (Thiosulfate): Contains one $\text{S}-\text{S}$ bond.${\text{S}}_4{\text{O}}_6^{2-}$ (Tetrathionate): Contains $\text{S}-\text{S}-\text{S}-\text{S}$ linkage.${\text{S}}_2{\text{O}}_7^{2-}$ (Pyrosulfate): Contains $\text{S}-\text{O}-\text{S}$ linkage.${\text{S}}_2{\text{O}}_8^{2-}$ (Peroxodisulfate): Contains $\text{S}-\text{O}-\text{O}-\text{S}$ linkage.Therefore, the pair where both have $\text{S}-\text{S}$ bonds is ${\text{S}}_4{\text{O}}_6^{2-}$ and ${\text{S}}_2{\text{O}}_3^{2-}$.