A bottle of medicine, a rechargeable battery, a water purifier and even the food stored in your kitchen are connected to Chemistry in some way. For a Class 12 student, however, Chemistry has an additional importance: it can strongly influence the final board percentage and also plays a major role in entrance examinations such as NEET, JEE Main and CUET.
The subject often feels difficult because it combines three different study styles. Physical Chemistry requires formulas and calculations, Organic Chemistry demands an understanding of reactions, while Inorganic Chemistry needs careful reading and systematic revision. Students who prepare all three areas in the same way usually struggle to retain information or apply concepts correctly.
The CBSE Class 12 Chemistry Syllabus 2026 for the 2025–26 academic session contains ten theory units. The complete subject carries 100 marks, divided into a 70-mark theory examination and a 30-mark practical assessment. The board paper contains 33 questions distributed across five sections, including multiple-choice, short-answer, case-based and long-answer questions. Understanding this structure early helps students select the right chapters, practise according to marks and avoid studying topics outside the prescribed syllabus.
CBSE Class 12 Chemistry Syllabus 2026: Overview
| Particulars | Details |
| Board | Central Board of Secondary Education |
| Subject | Chemistry |
| Subject code | 043 |
| Class | 12 |
| Academic session | 2025–26 |
| Board examination year | 2026 |
| Total marks | 100 |
| Theory examination | 70 marks |
| Practical examination | 30 marks |
| Theory paper duration | 3 hours |
| Total theory questions | 33 |
| Number of theory units | 10 |
| Question types | MCQs, short answers, case-based and long answers |
| Prescribed textbook | NCERT Chemistry Class 12, Parts I and II |
| Calculator and log table | Not permitted |
| Overall choice | Not provided |
| Internal choice | Available in selected questions |
CBSE Class 12 Chemistry Exam Pattern 2026
The Chemistry theory paper is divided into five sections. All 33 questions are compulsory, but internal alternatives are provided in some questions.
| Section | Type of Questions | Number of Questions | Marks per Question | Total Marks |
| Section A | Multiple-choice questions | 16 | 1 | 16 |
| Section B | Short-answer questions | 5 | 2 | 10 |
| Section C | Short-answer questions | 7 | 3 | 21 |
| Section D | Case-based questions | 2 | 4 | 8 |
| Section E | Long-answer questions | 3 | 5 | 15 |
| Total | 33 | 70 |
Students receive three hours to complete the examination. Calculators and log tables are not allowed, so calculation practice should form a regular part of preparation. The assessment structure used in the previous academic session continues for the 2025–26 board examination.
CBSE Class 12 Chemistry Unit-Wise Weightage
| Unit | Chapter | Marks |
| Unit 1 | Solutions | 7 |
| Unit 2 | Electrochemistry | 9 |
| Unit 3 | Chemical Kinetics | 7 |
| Unit 4 | d- and f-Block Elements | 7 |
| Unit 5 | Coordination Compounds | 7 |
| Unit 6 | Haloalkanes and Haloarenes | 6 |
| Unit 7 | Alcohols, Phenols and Ethers | 6 |
| Unit 8 | Aldehydes, Ketones and Carboxylic Acids | 8 |
| Unit 9 | Amines | 6 |
| Unit 10 | Biomolecules | 7 |
| Total | 70 |
Electrochemistry carries the highest individual unit weightage with nine marks, followed by Aldehydes, Ketones and Carboxylic Acids with eight marks. However, students should not leave any unit because the final paper may combine concepts from different chapters. (Career Power)
Unit 1: Solutions
The Solutions chapter introduces the behaviour of different types of mixtures and the numerical relationships between solute and solvent.
Important topics include:
- Types of solutions
- Expression of concentration
- Mass percentage and volume percentage
- Mole fraction
- Molarity and molality
- Solubility of gases in liquids
- Solid solutions
- Raoult’s law
- Ideal and non-ideal solutions
- Colligative properties
- Relative lowering of vapour pressure
- Elevation of boiling point
- Depression of freezing point
- Osmotic pressure
- Abnormal molecular mass
- Van’t Hoff factor
Students should pay close attention to units while solving numerical questions. Molarity changes with temperature, while molality does not. Such small conceptual differences are frequently tested through MCQs and case-based questions.
Practise questions involving association, dissociation and the Van’t Hoff factor because they combine concepts with calculations.
Unit 2: Electrochemistry
Electrochemistry connects chemical reactions with the production and movement of electrical energy.
The chapter covers:
- Redox reactions
- Electrochemical cells
- Galvanic and electrolytic cells
- Electrode potential
- Standard electrode potential
- EMF of a cell
- Nernst equation
- Gibbs energy and cell EMF
- Conductance of electrolytic solutions
- Specific conductivity
- Molar conductivity
- Variation of conductivity with concentration
- Kohlrausch’s law
- Electrolysis
- Faraday’s laws
- Dry cells
- Lead accumulator
- Fuel cells
- Corrosion
Students should learn the correct arrangement of anode, cathode and salt bridge in an electrochemical cell. Sign errors in cell potential calculations can lead to an incorrect answer even when the formula is correct.
Graphs showing the variation of molar conductivity with concentration are also important.
Unit 3: Chemical Kinetics
Chemical Kinetics studies how quickly a reaction occurs and the factors that affect its speed.
Major topics include:
- Average rate of reaction
- Instantaneous rate
- Factors affecting reaction rate
- Concentration and temperature effects
- Role of catalysts
- Rate law
- Rate constant
- Order of reaction
- Molecularity
- Integrated rate equations
- Zero-order reactions
- First-order reactions
- Half-life
- Activation energy
- Arrhenius equation
- Collision theory
Students should clearly understand the difference between order and molecularity. They should also practise identifying the order of a reaction from units of the rate constant.
Numerical questions involving half-life and integrated rate equations can become scoring once the formulas and logarithmic calculations are practised regularly.
Unit 4: d- and f-Block Elements
This Inorganic Chemistry unit deals with transition and inner-transition elements.
Important areas include:
- Electronic configuration
- Position in the periodic table
- Characteristics of transition elements
- Metallic character
- Ionisation enthalpy
- Oxidation states
- Ionic radii
- Coloured ions
- Magnetic properties
- Catalytic properties
- Alloy formation
- Interstitial compounds
- Potassium dichromate
- Potassium permanganate
- Lanthanoids
- Lanthanoid contraction
- Actinoids
- Comparison of lanthanoids and actinoids
Students should prepare trends through comparison tables rather than memorising isolated facts. Oxidation states, colours, magnetic behaviour and chemical reactions of potassium dichromate and potassium permanganate require frequent revision.
Unit 5: Coordination Compounds
Coordination Compounds is a concept-based unit that frequently includes nomenclature, bonding and isomerism questions.
The syllabus covers:
- Coordination entities
- Central metal atom or ion
- Ligands
- Coordination number
- Oxidation number
- IUPAC nomenclature
- Werner’s theory
- Valence Bond Theory
- Crystal Field Theory
- Shapes of complexes
- Magnetic properties
- Colour of coordination compounds
- Structural isomerism
- Stereoisomerism
- Importance of coordination compounds
Students should practise writing names from formulas and formulas from names. The order of ligands, oxidation state of the metal and correct use of prefixes must be checked carefully.
Drawing geometrical and optical isomers can improve both understanding and presentation.
Unit 6: Haloalkanes and Haloarenes
This chapter begins the major Organic Chemistry portion of the syllabus.
Important topics include:
- Nomenclature
- Nature of the carbon-halogen bond
- Methods of preparation
- Physical properties
- Chemical reactions
- Nucleophilic substitution reactions
- SN1 and SN2 mechanisms
- Optical activity
- Reactions of haloarenes
- Uses and environmental effects of halogen compounds
Students should understand why haloarenes are less reactive towards nucleophilic substitution than haloalkanes. Mechanism-based answers should show electron movement and intermediate formation clearly.
Named compounds and their environmental impact may also appear in direct questions.
Unit 7: Alcohols, Phenols and Ethers
This unit includes preparation methods, properties and reactions of three important functional groups.
Alcohols
Prepare:
- Nomenclature
- Preparation methods
- Physical properties
- Reactions of primary alcohols
- Identification of primary, secondary and tertiary alcohols
- Dehydration mechanism
- Uses of methanol and ethanol
Phenols
Important topics include:
- Preparation
- Acidic nature
- Electrophilic substitution
- Physical and chemical properties
- Uses of phenol
Ethers
Students should study:
- Nomenclature
- Williamson synthesis
- Physical properties
- Chemical reactions
- Cleavage of ethers
- Uses
Reaction conditions matter greatly in Organic Chemistry. Students should write the reagent above the arrow and temperature or other conditions below it wherever required.
Unit 8: Aldehydes, Ketones and Carboxylic Acids
This unit carries eight marks and contains several important reactions.
The syllabus covers:
- Nomenclature of aldehydes and ketones
- Nature of the carbonyl group
- Preparation methods
- Physical properties
- Chemical reactions
- Nucleophilic addition mechanism
- Reactions involving alpha hydrogen
- Oxidation and reduction
- Identification tests
- Uses of aldehydes and ketones
- Nomenclature of carboxylic acids
- Preparation of carboxylic acids
- Acidic nature
- Physical and chemical properties
- Uses
Students should create a reaction map connecting alcohols, aldehydes, ketones, acids and their derivatives. This makes conversion-based questions easier.
Tests such as Tollens’, Fehling’s and iodoform should be learnt with their observations and suitable examples.
Unit 9: Amines
The Amines chapter includes both aliphatic and aromatic nitrogen compounds.
Important topics include:
- Classification of amines
- Nomenclature
- Structure
- Preparation methods
- Physical properties
- Basic character
- Chemical reactions
- Identification of primary, secondary and tertiary amines
- Diazonium salts
- Preparation of diazonium salts
- Reactions of diazonium salts
- Importance in organic synthesis
Students should understand the order of basic strength in gaseous and aqueous phases. Questions may ask them to compare compounds and justify the order using electronic and solvation effects.
Diazonium salt reactions should be organised in a flowchart because they are frequently used in organic conversions.
Unit 10: Biomolecules
Biomolecules connects Chemistry with food, health and biological systems.
The chapter includes:
- Classification of carbohydrates
- Aldoses and ketoses
- Glucose and fructose
- D and L configurations
- Sucrose, lactose and maltose
- Starch, cellulose and glycogen
- Amino acids
- Peptide bonds
- Polypeptides
- Protein structures
- Denaturation of proteins
- Enzymes
- Hormones
- Vitamins and their functions
- DNA and RNA
Students should prepare comparison tables for monosaccharides, disaccharides and polysaccharides. Vitamin deficiencies, protein structures and differences between DNA and RNA are suitable areas for MCQs and short-answer questions.
CBSE Class 12 Chemistry Practical Exam Pattern 2026
The practical examination carries 30 marks.
| Practical Component | Marks |
| Volumetric analysis | 8 |
| Salt analysis | 8 |
| Content-based experiment | 6 |
| Project work | 4 |
| Class record and viva | 4 |
| Total | 30 |
The practical syllabus includes volumetric analysis, qualitative salt analysis, chromatography, functional-group tests, preparation of compounds and content-based experiments. Students must also complete an investigatory project approved by their teacher.
Important Practical Areas
Students should prepare:
- Preparation of standard solutions
- KMnO₄ titration
- Identification of cations and anions
- Functional-group testing
- Tests for carbohydrates, fats and proteins
- Paper chromatography
- Preparation of inorganic or organic compounds
- Laboratory apparatus and precautions
During the viva, examiners may ask about the aim, principle, indicator, colour change, formula, procedure and precautions of an experiment. Students should therefore understand what they performed rather than memorising only the written record.
How to Prepare for CBSE Class 12 Chemistry Exam 2026
Divide the subject into Physical, Organic and Inorganic Chemistry and use a different method for each.
For Physical Chemistry, maintain a formula notebook and solve numericals daily. Write all units before substitution and avoid skipping calculation steps.
For Organic Chemistry, create reaction charts showing starting compounds, reagents, conditions and products. Learn mechanisms conceptually and practise conversions without looking at notes.
For Inorganic Chemistry, read NCERT line by line. Prepare compact comparison tables for oxidation states, colours, electronic configurations and chemical properties.
After finishing every unit, solve NCERT questions, exemplar problems and board-style questions. Do not wait until the entire syllabus is complete before beginning paper practice.
Attempt full 70-mark sample papers within three hours. Reserve time for checking chemical equations, charges, units, structures and question numbers.
Underline keywords in theory answers and balance every chemical equation. In numericals, write the formula and substitution even when the calculation appears simple, as the marking scheme may award marks for individual steps.
Frequently Asked Questions
Q1. How many chapters are included in the CBSE Class 12 Chemistry Syllabus 2026?
The theory syllabus contains ten units, starting with Solutions and ending with Biomolecules.
Q2. Which chapter carries the highest weightage in Class 12 Chemistry?
Electrochemistry carries nine marks, the highest individual unit weightage. Aldehydes, Ketones and Carboxylic Acids carry eight marks.
Q3. Is the practical examination compulsory in Class 12 Chemistry?
Yes. The practical assessment carries 30 marks and includes volumetric analysis, salt analysis, an experiment, project work, practical record and viva.
Q4. Is NCERT enough for CBSE Class 12 Chemistry preparation?
NCERT should be the main source for theory, reactions, examples and in-text questions. Students should also solve sample papers and previous board questions to improve application, accuracy and examination speed.