CBSE Class 11 Chemistry Important Topics for Half Yearly Exam 2025

The half yearly exams are one of the most important milestones in Class 11. Chemistry, being a conceptual and scoring subject, needs focused preparation. To help students revise smartly, we have listed the most important topics for CBSE Class 11 Chemistry Half Yearly Exam 2025.

 Why Focus on Important Topics?

• Saves time during revision
• Helps in covering high-weightage areas
• Improves chances of scoring better marks
• Builds a strong foundation for Class 12 and competitive exams like JEE/NEET

Unit-Wise Weightage of Chemistry Syllabus

Chapter-Wise Important Topics

Unit I – Some Basic Concepts of Chemistry

• Mole concept and stoichiometry
• Limiting reagent problems
• Laws of chemical combination

Unit II – Structure of Atom

• Bohr’s model and limitations
• Quantum numbers and their significance
• Electron configuration of elements

Unit III – Classification of Elements & Periodicity

• Modern periodic table and its development
• Periodic trends: ionisation energy, atomic size, electronegativity

Unit IV – Chemical Bonding & Molecular Structure

• Types of chemical bonds (ionic, covalent)
• VSEPR theory and shapes of molecules
• Hybridisation and Molecular Orbital Theory (basic concepts)

Unit V – Chemical Thermodynamics

• First law of thermodynamics (internal energy, enthalpy)
• Enthalpy changes in reactions (bond enthalpy, formation enthalpy)
• Gibbs free energy and spontaneity

Unit VI – Equilibrium

• Law of mass action and equilibrium constant
• Le Chatelier’s principle with examples
• Ionic equilibrium, pH, buffer solutions, solubility product

Unit VII – Redox Reactions

• Oxidation and reduction concepts
• Oxidation number method
• Balancing redox equations

Unit VIII – Organic Chemistry: Basic Principles & Techniques

• IUPAC nomenclature of organic compounds
• Electronic effects (inductive, resonance, hyperconjugation)
• Types of organic reactions and intermediates (carbocations, free radicals, carbanions)

Unit IX – Hydrocarbons

• Alkanes, alkenes, alkynes: preparation, properties, reactions
• Benzene structure and aromaticity
• Electrophilic substitution reactions and directive influence

Preparation Tips

• Focus on NCERT examples and exercises
• Revise numerical problems from Mole Concept, Thermodynamics, and Gas Laws
• Practice previous year half yearly papers
• Make short notes for quick revision before exam

Chemistry is all about concepts and practice. By preparing these important topics for CBSE Class 11 Chemistry Half Yearly Exam 2025, students can confidently attempt their paper and secure high marks. Stay consistent, revise daily, and practice numerical problems thoroughly.
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