Which of the following compounds mathematically yield a fractional average oxidation state, yet cons — Redox Reactions and Volumetric Analysis Chemistry Question

💡 Solution & Explanation

$C_3O_2$ has C in +2, 0, +2 (Avg +4/3). $Br_3O_8$ has Br in +6, +4, +6 (Avg +16/3). $S_4O_6^{2-}$ has S in +5, 0, 0, +5 (Avg +2.5). These arise from identical atoms in different bonding states. Superoxide ($O_2^-$), however, has a true delocalized fractional charge of -1/2 per oxygen.