why zinc oxide is considered amphoteric oxide?
Zinc oxide is considered amphoteric oxide because it reacts with both acids and bases to form salts.
ZnO + 2HCl → ZnCl2 ( Zinc chloride) + H2O
2NaOH + ZnO → Na2ZnO2 (Sodium zincate) + H2O
amphoteric is a compound that can react with acid and bases
amphoteric word is derived from a Greek in which the prefix Amphi- means both.
those Metal oxides which can react with both acids and bases to produce salts is called as amphoteric oxides, for example, the metal which forms amphoteric oxide are beryllium, zinc, tin, lead, aluminium.