Transition elements | Chemistry - Oxides and Oxoanions of Metals | 12th Chemistry : UNIT 4 : Transition and Inner Transition Elements

Chapter: 12th Chemistry : UNIT 4 : Transition and Inner Transition Elements

Oxides and Oxoanions of Metals

Generally, transition metal oxides are formed by the reaction of transition metals with molecular oxygen at high temperatures.

Oxides and Oxoanions of Metals

Generally, transition metal oxides are formed by the reaction of transition metals with molecular oxygen at high temperatures. Except the first member of 3d series, Scandium, all other transition elements form ionic metal oxides. The oxidation number of metal in metal oxides ranges from +2 to +7. As the oxidation number of a metal increases, ionic character decreases, for example, Mn₂O₇ is covalent. Mostly higher oxides are acidic in nature, Mn₂O₇ dissolves in water to give permanganic acid (HMnO₄ ) , similarly CrO₃ gives chromic acid (H₂CrO₄) and dichromic acid (H₂Cr₂O₇). Generally lower oxides may be amphoteric or basic, for example, Chromium (III) oxide - Cr₂O₃, is amphoteric and Chromium(II) oxide, CrO, is basic in nature.

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12th Chemistry : UNIT 4 : Transition and Inner Transition Elements : Oxides and Oxoanions of Metals | Transition elements | Chemistry