Question

what did you mean by amphoteric oxide

Answer 1

The metal oxide that reacts with both acid as well as base to produce salt and water are known as amphoteric oxides..
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Answer 2

In chemistry, an amphoteric compound is a molecule or ion that can react both as an acid and as a base. Many metals (such as copper, zinc, tin, lead, aluminium, and beryllium) form amphoteric oxides or hydroxides. Amphoterism depends on the oxidation states of the oxide. Al2O3 is an example of an amphoteric oxide.