What is the oxidation state of sulfur in potassium peroxydisulfate, a powerful oxidizing agent utilized extensively in organic synthesis and analytical procedures?

💡 Solution & Explanation

Potassium peroxydisulfate contains a peroxide linkage between two oxygen atoms where each oxygen has an oxidation number of minus one, and accounting for potassium and regular oxide ligands results in sulfur maintaining an oxidation state of plus six. Assigning a higher oxidation state violates peroxy bond electron accounting rules. Sulfur does not exhibit plus five as a stable principal oxidation state in such oxoanions. Standard sulfate groups also feature sulfur in the plus six oxidation state.