Examples:
Al2O3 is an amphoteric oxide. When reacted with HCl, it acts as a base to form the salt AlCl3. When reacted with NaOH, it acts as an acid to form NaAlO2.Typically, oxides of medium electronegativity are amphoteric.
Definition of Amphoteric Oxide
By Anne Marie Helmenstine, Ph.D., About.com Guide
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Typically, oxides of medium electronegativity are amphoteric.
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