Which of the following is the formula for sulfuric acid?

The formula for sulfuric acid is H₂SO₄. This chemical compound consists of two hydrogen atoms, one sulfur atom, and four oxygen atoms. Sulfuric acid is a strong mineral acid widely used in various industrial processes, as well as in car batteries and fertilizer production. Its formula reflects its composition, allowing chemists to understand the relationships between the elements involved and the acid's properties. Understanding chemical formulas is crucial in chemistry, as they convey valuable information about the structure and reactivity of compounds.

The other options represent different substances: HCl is hydrochloric acid, HNO₃ is nitric acid, and CO₂ is carbon dioxide. Each of these compounds has distinct properties and uses, therefore highlighting the importance of correctly identifying sulfuric acid by its chemical formula.