Final answer:
The formula for hydrosulfuric acid is H₂S option (b), which is a weak and less commonly found acid as opposed to sulfuric acid (H₂SO₄), a strong and widely used industrial chemical.
Step-by-step explanation:
The formula for hydrosulfuric acid is H₂S. It is a binary acid composed of hydrogen and sulfur. Unlike sulfuric acid (H₂SO₄), which is a strong acid used in industrial processes, hydrosulfuric acid is a weak acid generally not found in concentrated form.
Other compounds such as perchloric acid (HClO₄), hydriodic acid (HI), phosphorous acid (H₃PO₃), and sulfuric acid (H₂SO₄) have different compositions and properties. Sulfuric acid in particular is notable for being a very strong acid and a widely used chemical.
For instance, the strong acid nature of sulfuric acid is evidenced by the equilibrium of its dissociation lying far to the right, with a predominantly H₂SO₄ (aq) present compared to its dissociated forms HSO₄⁻ (aq) and SO₄²⁻ (aq).