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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-O-S link.
Pyrosulphuric acid is prepared by dissolving sulphur trioxide in concentrated sulphuric acid. `SO_(3) + H_(2) SO_(4) to H_(2) S_(2) O _(7)`
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