Question

What are the general characteristics of first row transition metal oxides?

Answer 1

1. Oxides in lower oxidation states are generally basic, while those in higher oxidation states are acidic. Oxides in intermediate oxidation states are amphoteric.
2. Basic and amphoteric oxides dissolve in nonoxidizing acids to form hexaaqua metal ions.
3. These metals form mixed oxides (made of two simple oxides), non-stoichiometric oxides (with non-integer metal-oxygen ratios), and spinel-type oxides where oxygen forms a face-centered cubic lattice.
4. Examples include oxides like Fe₃O₄ (mixed oxide) and ZnFe₂O₄ (spinel).
5. Transition metal oxides often exhibit variable oxidation states and can show acidic, basic, or amphoteric character depending on the metal and its oxidation state.