find the total numbers of compounds which contain S-S linkage.
`H_(2)S_(2)O_(3),H_(2)S_(2)O_(5),H_(2)S_(4)O_(6),H_(2)S_(2)O_(7),H_(2)S_(2)O_(8),H_(2)S_(2)O_(6)`

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1 Answers

`H_(2)SO_(3)` has a lone pair of electrons on the central sulphur atom.

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