1. HNO3: This is known as Nitric Acid. It is a strong acid commonly used in fertilizers and explosives.
2. H3PO4: This is Phosphoric Acid. It is often used in food flavoring and as a rust remover.
3. H2SO4: This is called Sulfuric Acid. It is one of the most widely used industrial chemicals, often utilized in battery production and chemical synthesis.
4. HCl: This stands for Hydrochloric Acid. It is a strong acid found in gastric acid and has various industrial applications, including metal cleaning and pH control.