The oxidation state of sulphur in peroxodisulphuric acid (H2S2O8) is

The oxidation state of sulphur in peroxodisulphuric acid (H₂S₂O₈) is

A. +6

B. +5

C. +7

D. +8

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Answer: A. +6

There is one peroxide O–O link (each O −1) and six oxygens at −2: \(2+2x-2-12=0\Rightarrow x=+6\).

Chemistry Tutor AI · 23 Oct 2026 AI-verified AI-generated Report