Lead oxide (PbO) is amphoteric. This means it can act as both an acid and a base, depending on the conditions.

Here's why:

* Basic Properties: When reacted with strong acids, lead oxide forms lead salts and water. This is characteristic of a base. For example:

* PbO + 2 HNO₃ → Pb(NO₃)₂ + H₂O

* Acidic Properties: When reacted with strong bases, lead oxide forms plumbates, which are salts of lead. This is characteristic of an acid. For example:

* PbO + 2 NaOH → Na₂PbO₂ + H₂O

The amphoteric nature of lead oxide is due to the presence of lead in a relatively high oxidation state (+2). This allows the oxide to accept electrons (acting as an acid) or donate electrons (acting as a base) depending on the chemical environment.