Amphoteric behaviour is shown by the oxides of:

Amphoteric oxides exhibit both acidic and basic behaviour. Salts are created when they interact with both acids and bases. Despite not dissolving in water, tin oxide has an amphoteric tendency. Additionally amphoteric in nature is zinc oxide.

$\begin{array}{l}\mathrm{ZnO}+\mathrm{HCl}\to {\mathrm{ZnCl}}_2+{\mathrm{H}}_2\mathrm{O}\\ \mathrm{ZnO}+\mathrm{NaOH}\to {\mathrm{Na}}_2{\mathrm{ZnO}}_2+{\mathrm{H}}_2\mathrm{O}\\ {\mathrm{SnO}}_2+\mathrm{HCl}\to {\mathrm{SnCl}}_4+{\mathrm{H}}_2\mathrm{O}\\ {\mathrm{SnO}}_2+\mathrm{NaOH}+{\mathrm{H}}_2\mathrm{O}\to {\mathrm{Na}}_2\left[\mathrm{Sn}(\mathrm{OH}{)}_6\right]\end{array}$