What is the oxidation state of sulfur in Marshall's acid, \(H_2S_2O_8\)?
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Always check for peroxide linkage \(( -O-O- )\) in compounds like:
• \(H_2O_2\)
• \(H_2S_2O_8\)
• \(Na_2O_2\)
In peroxide linkage, oxygen has oxidation state \(-1\), not \(-2\).