Question

Rainwater is normally the purest form of natural water, but it has some impurities. What are these impurities and how do they come into rainwater?

Answer 1

Rainwater consists of impurities in the form of dust particles, dissolved gases and acids. Dust particles are naturally introduced in the rainwater. Dissolved gases like carbon dioxide are added to the rain water through air. Acids are primarily added to the rain water because of pollution.