Oxidation States Easy for inorganic salts: CrO42-reduced to Cr2O3. -KMnO4 reduced to MnO2. .Oxidation:Gain of O,O2,or X2;loss of H2. Reduction:Gain of H2 (or H);loss of O or O2; and loss of X2. The gain or loss of H+,H2O,HX,etc.is neither an oxidation nor a reduction. Chapter 11 4 Chapter 11 4 Oxidation States • Easy for inorganic salts: ▪ CrO4 2- reduced to Cr2O3 . ▪ KMnO4 reduced to MnO2 . • Oxidation: Gain of O, O2 , or X2 ; loss of H2 . • Reduction: Gain of H2 (or H- ); loss of O or O2 ; and loss of X2 . • The gain or loss of H+ , H2O, HX, etc. is neither an oxidation nor a reduction