A) \[{{S}_{2}}O_{4}^{2-}\]
B) \[{{S}_{2}}O_{5}^{2-}\]
C) \[{{S}_{2}}O_{3}^{2-}\]
D) \[{{S}_{2}}O_{7}^{2-}\]
Correct Answer: D
Solution :
\[{{S}_{2}}O_{7}^{2-}\]has no \[S-S\]bond because sulphur atoms are linked through O-atoms. All other have \[S-S\]bond \[\begin{align} & OO\,\,OO \\ & ||\,\,||\,\,||\,\,|| \\ & \overset{-}{\mathop{O}}\,-S-S-{{O}^{-}}\,{{\,}^{-}}O-S-S-{{O}^{-}} \\ & || \\ & O \\ & ({{S}_{2}}{{O}_{4}}^{2-})\,({{S}^{2}}{{O}_{5}}^{2-}) \\ \end{align}\] \[\begin{align} & S\,\,O\,\,O \\ & ||\,\,||\,\,|| \\ & {{O}^{-}}-S-{{O}^{-}}\,\,{{O}^{-}}-S-O-S-{{O}^{-}} \\ & ||\,|\,\,|| \\ & O\,{{\,}^{-}}O\,\,O \\ & ({{S}_{2}}{{O}_{3}}^{2-})\,\,\,({{S}_{2}}{{O}_{7}}^{2-}) \\ \end{align}\]
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