Chemistry — SSC CGL Study Notes

Overview

Chemistry questions in SSC CGL Tier 1 typically constitute 4–6 marks out of the 25-mark General Science section. The exam tests foundational concepts from three areas: the periodic table and atomic structure, acid-base chemistry and pH, and basic organic chemistry including hydrocarbons and functional groups. Unlike board exams that require detailed derivations, SSC focuses on fact recall, simple applications, and real-world connections—think everyday chemicals, common reactions, and properties you can observe.

Success in this section requires memorizing key facts (atomic numbers, pH values, functional groups) and understanding simple cause-effect relationships (why metals react with acids, what makes a compound acidic). Questions are usually direct: "What is the pH of blood?" or "Which element has atomic number 26?" Occasionally you'll see application-based questions linking chemistry to daily life (bleaching powder composition, uses of common acids). The syllabus is broad but shallow—prioritize high-frequency topics and practice previous year questions to identify patterns.

Key Concepts

• **Periodic Table Organization**: Elements are arranged by increasing atomic number in 18 groups (vertical columns) and 7 periods (horizontal rows). Groups contain elements with similar chemical properties because they have the same number of valence electrons.