What happens when an acid reacts with a metal oxide? Explain with the help of an example. Write a balanced equation for the reaction involved.

When an acid reacts with metal oxide, A salt and water are obtained. The reaction can be written as follows,

Acid+ Metal oxide → Salt + water

An eg: when a small amount of copper oxide is added to sulphuric acid, colour of the solution becomes blue and the copper oxide dissolves. The blue colour of the solution indicates the formation of copper(II) sulphate

CuO(s) + H2SO4 → CuSO4(aq) + H2O(l)