International General Certificate of Secondary Education (IGCSE) Chemistry Practice Exam

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Prepare for the IGCSE Chemistry Exam with our comprehensive quiz. Practice with multiple choice questions and detailed explanations to boost your understanding. Excel in your examination journey!

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Which of the following is the formula for sulfuric acid?

HCl
H₂SO₄
HNO₃
CO₂

The correct answer is: H₂SO₄

The formula for sulfuric acid is represented as H₂SO₄. This compound consists of two hydrogen atoms, one sulfur atom, and four oxygen atoms. Sulfuric acid is a strong acid widely used in various applications, including industry, car batteries, and as a laboratory reagent. Understanding the molecular formula helps to identify the composition and structure of the compound. The subscript numbers indicate the quantity of each type of atom in the molecule, confirming that sulfuric acid specifically contains these elements in this ratio. In contrast, the other formulas represent different substances. HCl is hydrochloric acid, HNO₃ is nitric acid, and CO₂ is carbon dioxide, each with unique properties and uses. Therefore, knowing the distinct molecular formulas is important for recognizing the chemical nature and applications of each substance.