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Which of the following formulas represents Caro’s acid?

1. H2SO3
2. H2S2O5
3. H2SO5
4. H2S2O8

Correct answer: H2SO5

Solution

Caro's acid is peroxymonosulphuric acid, H2SO5, which contains one peroxy (-O-O-) linkage. (H2S2O8 is peroxydisulphuric/Marshall's acid.)

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