`Al_2O_3` is amphoteric -explain with suitable reactions.

Explanation

Amphoteric oxides are the oxides which possess both acidic as well as basic nature.
`Al_2 O_3` possess both acidic as well as basic behaviour.
`Al_2 O_3` react with both acids as well as bases to produce salts and water. Supporting reactions for amphoteric nature of `Al_2 O_3`.
With acids :
`Al_2 O_3 + 6HCl to underset("Aluminium chloride")(2AlCl_3 + H_2 O)`
b) With bases :
`Al_2 O_3 + 2NaOH to underset("Sodium metaluminate")(2Na AlO_2 + H_2 O)`