CBSE Class 11 Chemistry Deleted Syllabus for 2025 Exams: Check Chapter-Wise Topics, And Exercises Removed

Unit Number

Chapter Name

Deleted Topics

Added Topics

I

Some Basic Concepts of Chemistry

-

-

II

Structure of Atom

-

Discovery of Electron, Proton, and Neutron, atomic number, isotopes, and isobars. Thomson's model and its limitations. Rutherford's model and its limitations.

III

Classification of Elements and Periodicity in Properties

-

Significance of classification, a brief history of the development of the periodic table

IV

Chemical Bonding and Molecular Structure

-

-

V

Chemical Thermodynamics

-

-

VI

Equilibrium

-

-

VII

Redox Reactions

-

-

VIII

Organic Chemistry: Some Basic Principles and Techniques

-

-

IX

Hydrocarbons

-

-

Unit

Chapter

Deleted Topics

Chemistry – Part I

V. States of Matter: Gases and Liquids

Entire Chapter

Chemistry – Part II

IX. Hydrogen

Entire Chapter

Chemistry – Part II

X. s-Block Elements

Entire Chapter

Chemistry – Part II

XI. Some p-Block Elements

Entire Chapter

Chemistry – Part II

XIV. Environmental Chemistry

Entire Chapter

Units/Chapters

Deleted Topics

Topics covered in Deleted Units

Chemistry - Part I

• Unit V: States of Matter: Gases and Liquids

Complete Chapter

Three states of matter, intermolecular interactions, types of bonding, melting and boiling points, role of gas laws in elucidating the concept of the molecule, Boyle's law, Charles law, Gay Lussac's law, Avogadro's law, ideal behaviour, empirical derivation of gas equation, Avogadro's number, ideal gas equation. Deviation from ideal behaviour, liquefaction of gases, critical temperature, kinetic energy and molecular speeds (elementary idea) Liquid State: vapour pressure, viscosity and surface tension (qualitative idea only, no mathematical derivations) 

Chemistry—Part II

• Unit IX: Hydrogen 

Complete Chapter

Position of hydrogen in periodic table, occurrence, isotopes, preparation, properties and uses of hydrogen, hydrides-ionic covalent and interstitial; physical and chemical properties of water, heavy water, hydrogen peroxide - preparation, reactions and structure and use; hydrogen as a fuel.

• Unit X: s-Block Elements

Complete Chapter

Group 1 and Group 2 Elements General introduction, electronic configuration, occurrence, anomalous properties of the first element of each group, diagonal relationship, trends in the variation of properties (such as ionization enthalpy, atomic and ionic radii), trends in chemical reactivity with oxygen, water, hydrogen and halogens, uses. Preparation and Properties of Some Important Compounds: Sodium Carbonate, Sodium Chloride, Sodium Hydroxide and Sodium Hydrogencarbonate, Biological importance of Sodium and Potassium. Calcium Oxide and Calcium Carbonate and their industrial uses, biological importance of Magnesium and Calcium.

• Unit XI: Some p-Block Elements

Complete Chapter

General Introduction to p -Block Elements Group 13 Elements: General introduction, electronic configuration, occurrence, variation of properties, oxidation states, trends in chemical reactivity, anomalous properties of first element of the group, Boron - physical and chemical properties, some important compounds, Borax, Boric acid, Boron Hydrides, Aluminium: Reactions with acids and alkalies, uses. Group 14 Elements: General introduction, electronic configuration, occurrence, variation of properties, oxidation states, trends in chemical reactivity, anomalous behaviour of first elements. Carbon-catenation, allotropic forms, physical and chemical properties; uses of some important compounds: oxides. Important compounds of Silicon and a few uses: Silicon Tetrachloride, Silicones, Silicates and Zeolites, their uses. 

• Unit XIV: Environmental Chemistry

Complete Chapter

Environmental pollution - air, water and soil pollution, chemical reactions in atmosphere, smog, major atmospheric pollutants, acid rain, ozone and its reactions, effects of depletion of ozone layer, greenhouse effect and global warming- pollution due to industrial wastes, green chemistry as an alternative tool for reducing pollution, strategies for control of environmental pollution.