why Aluminium oxide is called as amphoteric oxide
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because aluminium can react with both acid and base form aluminium oxide which is an amphoteric
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"It has reactions as both a base and an acid. Reaction with water: Aluminum oxide is insoluble in water and does not react like sodium oxide and magnesium oxide. The oxide ions are held too strongly in the solid lattice to react with the water. ... This reaction and others display the amphotericnature of aluminum oxide."
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