Chemistry - Complete P-block Question with Solution | TestHub

Metallic oxides are basic in nature, Oxides of non-metals are mostly acidic in nature and some are neutral or amphoteric.

Among the given oxides ${\mathrm{Na}}_2\mathrm{O}$ is a metallic oxide, and it is basic in nature.

${\mathrm{Cl}}_2{\mathrm{O}}_7$ is a non-metal oxide and it is acidic in nature.

${\mathrm{N}}_2\mathrm{O}$ and $\mathrm{NO}$ are non-metallic oxides but are neutral in nature.

${\mathrm{As}}_2{\mathrm{O}}_3$ is an Amphoteric oxide. It reacts with both acids and bases.

So, The number of amphoteric oxides is 1.