Although metals form basic oxides, which of the following metals form an amphoteric oxide? (a) Na (b) Ca (c) Al (d) Cu

Answer: (c) Al

An amphoteric oxide is an oxide that can act either as an acid or as a base to create salt and water in a reaction. The oxidation states open to a chemical species are based on amphoterism. Amphoteric oxides and hydroxides are formed when metals have several oxidation states.

The reactions are given below:
Acts as a basic oxide
Al2O3+ 6HCl → 2AlCl3 + 3H2O
Acts as an acidic oxide
Al2O3+ 2NaOH → 2NaAlO2 + H2O

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