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Which oxyacid of sulphur has S-O-S link ...

Which oxyacid of sulphur has `S-O-S` link ? How is it prepared?

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`H_(2)S_(2)O_(7)` oleum (or) fuming (or) pyrosulphuric acid has `S-S-S` link.
Pyrosulphuric acid is prepared by dissolving sulphur trioxide in concentrated sulphuric acid.
`SO_(3)+H_(2)SO_(4)rarr H_(2)S_(2)O_(7)`
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