___________ is an oxide which is amphoteric.

Explanation

(i) An oxide which shows both acidic as well as basic properties is called and amphoteric oxide.
(ii) Metal oxides are usually basic in nature.
(iii) But some metal oxides like aluminium oxide, zinc oxide, etc, react both with acid as well as bases to produce salt and water.
(iv) Aluminium oxide shows both acidic as well as basic peroperties.
(v) Hence, aluminium oxide is called an amphoteric oxide