Question

Name the following:
Metals which forms an amphoteric oxide.

Answer 1

Metals which form an amphoteric oxide are zinc, tin, lead, aluminium and beryllium. e.g., Zinc and aluminium forms zinc oxide (ZnO) and aluminium oxide (Al${}_2$O${}_3$) respectively.
Amphoteric oxides react with acids as well as bases. Thus $ZnO$ will react with $HCl$ as well as with $NaOH$.
$ZnO+2HCl\to ZnC{l}_2+H_{2}O$
$ZnO+2NaOH\to N{a}_{2}Zn{O}_2+H_{2}O$