Final answer:
Among the given options, Acetic acid (CH₃COOH) is not a strong acid in aqueous solution. It is a weak acid because it does not dissociate completely in water, contrary to the strong dissociation of Hydrochloric acid (HCl), Sulfuric acid (H₂SO₄), and Nitric acid (HNO₃).
Step-by-step explanation:
The options include Hydrochloric acid (HCl), Sulfuric acid (H₂SO₄), Acetic acid (CH₃COOH), and Nitric acid (HNO₃). Among these, HCl, H₂SO₄, and HNO₃ are strong acids that dissociate completely in water.
However, Acetic acid, which is found in vinegar, does not dissociate completely and exists mainly in the form of neutral molecules. Less than 1% of acetic acid dissociates in aqueous solution, which makes it a weak acid. Therefore, the correct answer is that acetic acid, or CH₃COOH, is not a strong acid in aqueous solution.