How will you show with an example that metal oxides are basic in nature? Give the chemical equation also.

Bases generate OH^- ions when dissolved in water. Metal oxides when dissolved in water form respective hydroxides. This proves that metal oxides are basic in nature.

For example: When sodium oxide reacts with water, it gives sodium hydroxide. Sodium hydroxide contains OH^- ions which show that sodium oxide is basic in nature. The reaction is given as:

Na₂O+H₂O→2NaOH