Write four uses of chlorine

Write 'four' uses of hydrochloric acid. , Write chemical formula of the following oxoacids of chlorine : (a) Hypochlorous acid (b) Chlorous acid (c) Chloric acid (d) Perchloric acid

Name four oxyacids of chlorine. Give their molecular formulae.

Of the four oxyacids of chlorine the strongest oxidising agent in dilute aqueous solution is :

In the space given below, write any four uses of air and water on the Earth.