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Most metal oxides are alkaline oxides, but there are also some metal oxides that are amphoteric oxides, such as aluminum oxide, zinc oxide, etc. This type of oxide becomes alkaline when exposed to strong acids and acidic when exposed to strong bases. It can react with both acids and bases. Both generate salt and water. The oxides of amphoteric elements and the intermediate valence state oxides of variable valence metals are usually amphoteric oxides. What is metal oxide? Metal oxide refers to a binary compound composed of oxygen element and another metal chemical element, such as iron oxide (Fe ₂ O3), sodium oxide (Na ₂ O), etc. Metal oxides include alkaline oxides, acidic oxides, peroxides, superoxide, and amphoteric oxides. Metal oxides are widely used in daily life. Lime is a commonly used desiccant and can also be used for disinfection; Iron oxide (Fe ₂ O3), commonly known as iron red, can be used as a red pigment; Some catalysts used in industrial processes are also metal oxides. What are the common metal oxides? Metal oxides include CuO, MnO2, MgO, Fe2O3, Fe3O4, CaO, Al2O3. Common non-metallic oxides include CO, CO2, SO2, P2O5, H2O, SO3, H2O2