Question

the metallic oxide which gives our salt and water when reactas with a base is called?

Answer 1

Usually metallic oxides are basic in nature and reacts with acids to give neutralisation reaction , but some metallic oxides act as both acidic and basic.
These are known as AMPHOTERIC OXIDES.
For example ,
Zinc oxide reacts with sodium hydroxide which is a base.
ZnO + 2NaOH ------> Na2ZnO2 + H2O