Question

Write an activity that shows metal oxides forms bases.

Answer 1

Answer: Burn a magnesium ribbon. You will find that the magnesium ribbon burns with a dazzling white flame. Bring a wet red litmus paper near the flame.  

Explanation:

Answer 2

Electrolysis of NaCl in presence of water.

That is... NaCl + H2O = NaOH + HCl

Here NaOH is base