Consider the following sulphure based oxoacids. H 2 SO 3 , H 2 SO 4 , H 2 S 2 O 8 and H 2 S 2 O 7 . Amongst these oxoacids, the number of those with peroxo O - O bond is

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The structure of these oxoacids will be as follow. As we can see from the above structures only the Marshall Acid H 2 S 2 O 8 ​ also known as peroxydisulphuric acid has the peroxo bond.

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