$H N {O}_{3}$ (nitric acid) is used to make fertilisers such as ammonium nitrate. It is also used in the manufacture of explosives such as TNT.
${H}_{2} S {O}_{4}$ (sulphuric acid) is used for making fertilisers such as ammonium sulphate, making detergents such as liquid shampoos and soaps, and in the extraction of pigments such as titanium dioxide for use in (white) paint.
$H C l$ (hydrochloric acid) is used for removing rust or iron oxide scale from steel (pickling), in controlling the pH of industrial waste-water before it is allowed to run into rivers, and in the manufacture of many chlorinated organic substances.