Which of the following species structurally contain at least one peroxide linkage (-O-O-)? — Redox Reactions and Volumetric Analysis Chemistry Question

💡 Solution & Explanation

$CrO_5$ has two peroxy linkages. $H_2SO_5$ (Caro's acid) and $H_2S_2O_8$ (Marshall's acid) both possess peroxide linkages which ensure the central Sulfur atom does not exceed its maximum +6 valence state. $S_4O_6^{2-}$ contains a disulfide (S-S) bond, not a peroxide bond.