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Which of the following oxoacid of sulphur has –O–O– linkage?

1. H2SO4, sulphuric acid
2. H2S2O8, peroxodisulphuric acid
3. H2S2O7, pyrosulphuric acid
4. H2SO3, sulphurous acid

Correct answer: H2S2O8, peroxodisulphuric acid

Solution

H2S2O8 (peroxodisulphuric acid) contains a peroxo (-O-O-) linkage, which is characteristic of its structure. The other options do not have this linkage.

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