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  4. There is no SS bond in:

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Q. There is no $ SS $ bond in:

MGIMS WardhaMGIMS Wardha 2006

Solution:

in $ {{S}_{2}}O_{7}^{2-} $ ion the two sulphur atoms are linked through an oxygen atom. Each sulphur atom is further linked with oxygen atoms. Its structure is: $ ^{-}O-\underset{\begin{smallmatrix} |\,| \\ O \end{smallmatrix}}{\overset{\begin{smallmatrix} O \\ |\,| \end{smallmatrix}}{\mathop{S}}}\,-O-\underset{\begin{smallmatrix} |\,| \\ O \end{smallmatrix}}{\overset{\begin{smallmatrix} O \\ |\,| \end{smallmatrix}}{\mathop{S}}}\,-{{O}^{-}} $ In all other ions $ SS $ bond is present $ {{S}_{2}}O_{4}^{2-}ion{{\to }^{-}}O-\overset{\begin{smallmatrix} O \\ || \end{smallmatrix}}{\mathop{S}}\,-\overset{\begin{smallmatrix} O \\ || \end{smallmatrix}}{\mathop{S}}\,-{{O}^{-}} $ $ {{S}_{2}}O_{5}^{2-}ion{{\to }^{-}}O-\underset{\begin{smallmatrix} |\,| \\ O \end{smallmatrix}}{\overset{\begin{smallmatrix} O \\ |\,| \end{smallmatrix}}{\mathop{S}}}\,-O-\underset{{}}{\overset{\begin{smallmatrix} O \\ |\,| \end{smallmatrix}}{\mathop{S}}}\,-{{O}^{-}} $ $ {{S}_{2}}O_{3}^{2-}ion{{\to }^{-}}O-\underset{\begin{smallmatrix} |\,| \\ O \end{smallmatrix}}{\overset{\begin{smallmatrix} O \\ |\,| \end{smallmatrix}}{\mathop{S}}}\,-{{O}^{-}} $