हिंदी
Tamil Nadu Board of Secondary EducationHSC Science Class 11
पाठ्यपुस्तक उत्तर९७२७
अवधारणा स्पष्टीकरण१३८
पाठ्यक्रम

Chemistry HSC Science Class 11 Tamil Nadu Board of Secondary Education Syllabus 2025-26

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Tamil Nadu Board of Secondary Education Class 11 Chemistry Syllabus - Free PDF Download

Tamil Nadu Board of Secondary Education Syllabus 2025-26 Class 11: The Tamil Nadu Board of Secondary Education Class 11 Chemistry Syllabus for the examination year 2025-26 has been released by the Tamil Nadu Board, Tamil Nadu Board of Secondary Education. The board will hold the final examination at the end of the year following the annual assessment scheme, which has led to the release of the syllabus. The 2025-26 Tamil Nadu Board of Secondary Education Class 11 Chemistry Board Exam will entirely be based on the most recent syllabus. Therefore, students must thoroughly understand the new Tamil Nadu Board of Secondary Education syllabus to prepare for their annual exam properly.

The detailed Tamil Nadu Board of Secondary Education Class 11 Chemistry Syllabus for 2025-26 is below.

Academic year:

Tamil Nadu Board of Secondary Education Class 11 Chemistry Revised Syllabus

Tamil Nadu Board of Secondary Education Class 11 Chemistry Course Structure 2025-26 With Marking Scheme

#Unit/TopicWeightage
1  Basic Concepts of Chemistry and Chemical Calculations 
2  Quantum Mechanical Model of Atom 
3  Periodic Classification of Elements 
4  Hydrogen 
5  Alkali and Alkaline Earth Metals 
6  Gaseous State 
7  Thermodynamics 
8  Physical and Chemical Equilibrium 
9  Solutions 
10  Chemical Bonding 
11  Fundamentals of Organic Chemistry 
12  Basic Concept of Organic Reactions 
13  Hydrocarbons 
14  Haloalkanes and Haloarenes 
15  Environmental Chemistry 
 Total -
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Syllabus

1 Basic Concepts of Chemistry and Chemical Calculations [Revision]
  • Chemistry - the Centre of Life  
  • Classification of Matter  
  • Atomic and Molecular Masses  
  • Mole Concept  
    • Definition: Mole
    • Definition: Avogadro's Number
  • Gram Equivalent Concept  
    • Definition
    • Equivalent Mass of Acids, Bases, Salts, Oxidising Agents and Reducing Agents
  • Empirical Formula and Molecular Formula  
    • Determination of Empirical Formula from Elemental Analysis Data
    • Calculation of Molecular Formula from Empirical Formula
  • Stoichiometry and Stoichiometric Calculations  
    • Chemical reactions: Reactants, Products, Chemical equation
    • Stoichiometry
    • Steps for writing balanced chemical equation
    • Mass relationship
    • Calculations based on stoichiometry
      1) Mole to mole relationships
      2) Mass-mass relationships
      3) Mass-volume relationship
      4) Volume-volume relationship
    • Limiting reactant
    • Excess reactant
  • Concept of Redox Reactions  
2 Quantum Mechanical Model of Atom [Revision]
  • Introduction to Atom Models  
    • Bohr atom model
    • Limitation of Bohr's atom model
    • J. J. Thomson’s Model (Water melon model)
    • Rutherford’s model
    • Atomic spectra
  • Wave Particle Duality of Matter  
    • Quantisation of angular momentum and de Broglie concept
    • Davison and Germer experiment
  • Towards Quantum Mechanical Model of the Atom  
  • Quantum Mechanical Model of Atom – SchröDinger Equation  
    • Main features of the quantum mechanical model of atom
  • Quantum Numbers  
    • Principal quantum number (n)
    • Azimuthal Quantum number (l) or subsidiary quantum number
    • Magnetic quantum number (ml)
    • Spin quantum number (ms)
    • Shapes of atomic orbitals
    • Radial distribution function
    • Angular distribution function
    • Energies of orbitals
  • Filling of Orbitals  
    • Aufbau principle
    • Pauli Exclusion Principle
    • Hund's rule of maximum multiplicity
    • Electronic configuration of atoms
    • Stability of half filled and completely filled orbitals
    • Symmetrical distribution of electron
    • Exchange energy
3 Periodic Classification of Elements [Revision]
  • Classification of Elements  
    • Key Points: Classification of Elements
  • Moseley's Work and Modern Periodic Law  
    • Modern Periodic Table 
  • Nomenclature of Elements with Atomic Number Greater than 100  
    • Notation for IUPAC Nomenclature of Elements
  • Grouping of Elements Based on Electronic Configurations  
    • Variation of Electronic Configuration along the periods
    • Variation of Electronic Configuration in the Groups
  • Periodic Trends in Properties of Elements  
    • Atomic radius
    • Covalent radius
    • Metallic radius
    • Periodic Trends in Atomic Radius
    1. Variation in Periods
    2. Effective nuclear charge
    3. Variation in Group
    • Ionic radius
    • Ionisation energy
    • Successive Ionisation energies
    • Periodic Trends in Ionisation Energy
    • Periodic variation in group
    • Ionisation energy and shielding effect
    • Electron Affinity
    • Variation of Electron Affinity in a period
    • Variation of Electron affinity in a group
    • Electronegativity
    • Variation of Electronegativity in a period
    • Variation of Electronegativity in a group
  • Periodic Trends in Chemical Properties  
    • Valence or Oxidation States
    • Periodicity of Valence or Oxidation States
    • Anomalous properties of second period elements
    • Diagonal Relationship
    • Periodic Trends and Chemical Reactivity
4 Hydrogen [Revision]
  • Hydrogen  
  • Preparation of Hydrogen Peroxide  
    • Hydrogen peroxide (H2O2)
    • Preparation of hydrogen peroxide (H2O2)
    1. Merck's. process (Laboratory method)
    2. By the action of sulphuric acid or phosphoric acid on hydrated barium peroxide BaO2.8H2O
    3. Industrial method
    4. By redox process
    • Preparation of Deuterium
    • Electrolysis of heavy water
    • Preparation of Tritium
  • Properties of Hydrogen  
    • Physical Properties
    • Chemical Properties
    • Chemical properties of Deuterium
    • Deuterium exchange reactions
    • Properties of Tritium
  • Uses of Hydrogen Peroxide  
  • Compounds of Hydrogen  
    • Water
    • Physical Properties
    • Chemical Properties
    • Hard and Soft Water
    • Temporary Hardness and its removal
    • Permanent Hardness
  • Heavy Water  
    • Heavy water (D2O)
    • Preparation
    • Properties of heavy water
    • Reactions
    • Uses of heavy water
  • Ozone Layer Depletion  
    • Hydrogen Peroxide  
      • Physical properties
      • Chemical properties
      • Uses of hydrogen peroxide
      • Structure of hydrogen peroxide
  • Hydrides  
    • Hydrides
    • Classification of hydrides
    1. Saline or ionic hydrides
    2. Molecular or covalent hydrides
      a. Electron-rich molecular hydrides
      b. Electron-precise molecular hydrides
      c. Electron-deficient molecular hydrides
    3. Metallic or non-stoichiometric (or interstitial) hydrides
  • Hydrogen Bonding  
5 Alkali and Alkaline Earth Metals [Revision]
6 Gaseous State [Revision]
  • States of Matter  
  • Gas Laws  
    • Definition: Gas Equation
    • Definition: Absolute Scale or Klevin Scale
  • Ideal Gas Equation  
    • Introduction
    • Definition: Ideal Gas Equation
    • Deriving the Ideal Gas Equation
    • Formula Combines Gas Law
    • Example
    • Key Points: Ideal Gas Equation
  • Mixture of Gases - Dalton’S Law of Partial Pressures  
    • Graham’ s Law of Diffusion
  • Behaviour of Real Gases: Deviation from Ideal Gas Behaviour  
    • Real gases
    • Reasons for deviations
    • van der Waals equation for real gases
    • Effect of pressure
    • Compressibility factor (Z)
    • Effect of temperature
    • Compressibility factor for real gases
    • Pressure-Volume isotherms of Carbon dioxide
    • Difference between Ideal gas and real gas
  • Derivation of Critical Constants from Van Der Waals Constant  
  • Liquefaction of Gases and Critical Constant  
7 Thermodynamics [Revision]
  • Thermodynamics  
  • System and Surrounding  
    • Types of systems
    1. Isolated system
    2. Closed system
    3. Open system
    • Properties of the system
    • Intensive and extensive properties
    • Thermodynamic processes
    • Types of processes
    1. Reversible process
    2. Irreversible Process
    3. Adiabatic process
    4. Isothermal process
    5. Isobaric process
    6. Isochoric process
    7. Cyclic process
    8. Compression processes
    • Internal Energy (U)
    • Characteristics of internal energy (U)
    • Work(w)
  • Measurement of Temperature  
    • Definition: Adiabatic Wall
    • Definition: Diathermic Wall
    • Definition: Thermal Equilibrium
    • Definition: Thermometry
    • Law: Zeroth Law of Thermodynamics
    • Temperature Scales
    • Conversion Formulas
    • Thermometers Use the Zeroth Law
    • Thermometric Property
    • Types of Thermometers
    • Characteristics of a Good Thermometer
    • Example 1
    • Example 2
    • Example 3
    • Example 4
    • Summary
  • Chemical Thermodynamics and Energetic  
  • Enthalpy (H)  
  • Enthalpy Change, ∆_rH of a Reaction - Reaction Enthalpy  
    • Thermochemical Equations  
      • Heat of combustion
      • Molar heat capacities
      • Relation between Cp and Cv for an ideal gas
  • Measurement of ΔU and ΔH Using Calorimetry  
    • ΔUMeasurements
    • ΔH Measurements
    • Applications of the heat of combustion
    1. Calculation of heat of formation
    2. Calculation of calorific value of food and fuels
  • Hess’s Law of Constant Heat Summation  
  • Lattice Energy  
    • Born - Haber cycle
  • Spontaneity  
    • Entropy and Second Law of Thermodynamics  
    • Absolute Entropy and Third Law of Thermodynamics  
  • Various Statements of the Second Law of Thermodynamics  
    • Entropy statement
    • Kelvin-Planck statement
    • Clausius statement
    • Spontaneity and Randomness
    • Standard Entropy Change(ΔS0)
    • Standard Entropy of Formation
    • Entropy of vapourisation
    • Entropy of transition
  • Gibbs Free Energy (G)  
    • Criteria for spontaneity of a process
    • Relationship between standard free energy change (ΔG0) and equilibrium constant (Keq)
8 Physical and Chemical Equilibrium [Revision]
  • Physical and Chemical Equilibrium  
    • Introduction
    • Physical equilibrium
    1. Solid-liquid equilibrium
    2. Liquid - Vapour equilibrium
    3. Solid - Vapour equilibrium
    • Equilibrium involving dissolution of solids or gases in liquids
    1. Solid in liquids
    2. Gas in liquids
  • Introduction of Chemical Equilibrium  
    • Chemical equilibrium
    • Two types of chemical equilibrium
      1) Homogeneous equilibrium
      2) Heterogeneous equilibrium
    • Characteristics of equilibria involving chemical processes
    • Graphical representation of chemical equilibrium
  • Homogeneous and Heterogenous Equilibria  
    • Homogeneous reactions and Heterogeneous reactions
    • Equilibrium constant for heterogeneous equilibria
    • Units of equilibrium constant
  • Chemical Thermodynamics and Energetic  
    • Equilibrium Constant  

      Thermodynamics 

  • Applications of Equilibrium Constants  
    • Prediction of the direction of the reaction
    • To know the extent of reaction
    • To calculate equilibrium concentrations
    • Link between chemical equilibrium and chemical kinetics
  • Le-Chatelier's Principle  
    • Effect of concentration
    • Effect of pressure
    • Effect of temperature
    • Effect of a catalyst
    •  Effect of inert gas 
  • Van't Hoff Equation  
9 Solutions [Revision]
10 Chemical Bonding [Revision]
11 Fundamentals of Organic Chemistry [Revision]
  • Organic Chemistry  
    • Definition: Organic Chemistry
    • Definition: Inorganic Chemistry
  • Classification of Organic Compounds  
  • Nomenclature  
    • Definition: Nomenclature
    • Key Points: Nomenclature of Carbon Compounds
  • Structural Representation of Organic Compounds  
  • Isomerism in Organic Compounds  
    • Constitutional isomers (Formerly structural isomers)
    1. Chain or nuclear or skeletal isomerism
    2. Position isomerism
    3. Functional isomerism
    4. Metamerism
    5. Tautomerism
    • Stereoisomerism
    • Geometrical isomerism
    • Optical Isomerism
    • Enantiomerism and optical activity
    • Conditions for enantiomerism or optical isomerism
  • Detection of Elements: Lassaigne's Test  
  • Estimation of Elements  
    • Estimation of carbon and hydrogen
    1.  Oxygen supply
    2. Combustion tube
    3. Absorption Apparatus
    • Estimation of halogens: carius method
    • Estimation of phosphorus
    • Estimation of nitrogen
    • Kjeldahls method
  • Purification of Organic Compounds  
12 Basic Concept of Organic Reactions [Revision]
  • Basic Concept of Organic Reactions  
    • Fundamental concepts in organic reaction mechanism
    • Fission of a covalent bond
    • Homolytic Cleavage
    • Heterolytic Cleavage
    • Hybridisation of carbon in carbocation
    • Nucleophiles and elctrophiles
    • Electron movement in organic reactions
    • Electron displacement effects in co-valent bonds
  • Different Types of Organic Reactions  
    • Substitution reaction (Displacement reaction)
    • Addition reactions
    • Functional Group inter conversion
13 Hydrocarbons [Revision]
  • Introduction and Classification of Alkanes  
  • Alkanes  
    • Definition: Alkanes
  • Alkenes  
    • Definition: Alkenes
  • Alkynes  
    • Definition: Alkynes
  • Aromatic Hydrocarbons  
14 Haloalkanes and Haloarenes [Revision]
  • Introduction to Haloalkanes and Haloarenes  
  • Classification of Organic Halogen Compounds  
  • Haloalkanes  
    • Nomenclature
    • Nature of C – X bond in haloalkane
    • Methods of preparation
    • Physical Properties
    • Chemical properties
  • Organo Metallic Compounds  
    • Preparation
    • Uses of Grignard reagent 
  • Haloarenes  
    • Nomenclature of haloarenes
    • Nature of C- X bond in haloarenes
    • Methods of preparation
    • Physical properties
    • Chemical properties
  • Poly Halogen Compounds  
    • Preparation
    • Physical Properties
    • Chemical properties
    • Methylene chloride (Di chloromethane) Preparation
    • Trihaloalkane
    • Tetra haloalkane
    • DDT (p,p’-dichloro diphenyl tri-chloro ethane)
15 Environmental Chemistry [Revision]
  • Atmospheric Pollution  
    • Stratospheric Pollution  
      • Stratospheric Pollution
      • Formation and Breakdown of Ozone
      • The Ozone Hole
      • Effects of Depletion of the Ozone Layer
  • Types of Environmental Pollution  
    • Air pollution
    1. Gaseous air pollutants
    2. Greenhouse effect and Global warming
    3. Acid Rain
    • Water pollution
    • Soil pollution
    • Particulate matter (Particulate pol-lutants)
    • Types of Particulates
    • Health effects of particulate pollutants
    • Techniques to reduce particulate pollutants
  • Quality of Drinking Water  
  • Environmental Issues  
  • Strategies to Control Environmental Pollution  
    • Strategy to control environmental pollution
    1. Incineration
    2. Digestion
    3. Collection and disposal
    4. Sewage treatment
    5. Other strategies
  • Green Chemistry - Introduction  

Textbook SolutionsVIEW ALL [1]

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