(ii) Explosives- The acid-base reaction of ammonia with nitric acid produces ammonium nitrate which is commonly used in explosives.
(iii) Soaps- Washing soda is a chemical substance used in soaps. It is derived from HCl and NaOH.
(iv) Fertilizers- Acid HCl is present in fertilizers which then reacts with water in field to impart H + ions which act as fertilizers.