Which of the following oxides are amphoteric?

$\mathrm{MgO},\mathrm{CaO},\mathrm{FeO},{\mathrm{Cu}}_2\mathrm{O},{\mathrm{Ag}}_2\mathrm{O},{\mathrm{Al}}_2{\mathrm{O}}_3,\mathrm{PbO},\mathrm{SnO}$

$\mathrm{ZnO},\mathrm{BeO},{\mathrm{Na}}_2\mathrm{O},{\mathrm{Cs}}_2\mathrm{O}$

[ If your answer is 2 then write the answer as 0002.]

Acidic Oxides $\to$ Non-metals (react with bases) ${\mathrm{CO}}_2,{\mathrm{SO}}_2,{\mathrm{NO}}_2$

Basic Oxides $\to$ Metals (react with acids)

${\mathrm{Na}}_2\mathrm{O},{\mathrm{K}}_2\mathrm{O},\mathrm{CaO}$

Amphoteric oxides $\stackrel{{\mathrm{CH}}_2{\mathrm{O}}_3,\mathrm{BeO},\mathrm{ZnO}}{\to }$ (reacts with both acids & bases)

Neutral oxides $\to$ (neither react with acids nor bases) $\mathrm{CO},\mathrm{NO},{\mathrm{N}}_2\mathrm{O}$.

There are total 5 oxides which are amphoteric.