- Hydrochloric acid (HCl) is a strong inorganic acid (mineral acid). - Nitric acid (HNO₃) is a strong inorganic acid (mineral acid). - Acetic acid (CH₃COOH) is a carboxylic acid and a weak organic acid. It is the main component of vinegar. - Sulphuric acid (H₂SO₄) is a strong inorganic acid (mineral acid).