The Bihar School Examination Board (BSEB) has officially released theBihar Board Class 12th Chemistry Syllabus 2025-2026 academic session. This syllabus is designed to build strong theoretical knowledge, practical application skills, and analytical thinking among students. It covers Physical Chemistry, Organic Chemistry, and Inorganic Chemistry in a balanced manner, which also supports preparation for competitive exams like JEE and NEET.
The syllabus is divided into 16 units along with practical work, ensuring that students gain both conceptual clarity and laboratory experience. Below is the complete unit-wise syllabus.
Bihar Board Class 12th Chemistry Syllabus 2025-2026 – Unit Wise
Unit 1 – Solid State
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General characteristics of solid state
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Amorphous and crystalline solids (elementary idea)
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Unit cell in two- and three-dimensional lattices
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Packing in solids, voids, calculation of density of unit cell
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Imperfections in solids
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Electrical and magnetic properties
Unit 2 – Solutions
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Types of solutions
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Expression of concentration (molarity, molality, mole fraction, percentage)
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Solubility of gases and solids in liquids
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Vapour pressure of liquid solutions
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Raoult’s law and colligative properties
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Abnormal molecular mass
Unit 3 – Electrochemistry
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Redox reactions and electrode potential
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Electrochemical and Galvanic cells
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Nernst equation
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Conductance of electrolytic solutions
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Kohlrausch’s law
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Electrolysis and Faraday’s laws
Unit 4 – Chemical Kinetics
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Rate of reaction
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Factors affecting reaction rate
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Order and molecularity of reaction
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Integrated rate equations
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Activation energy and Arrhenius equation
Unit 5 – Surface Chemistry
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Adsorption and its classification
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Catalysis – homogeneous and heterogeneous
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Colloidal state and its properties
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Emulsions and micelles
Unit 6 – General Principles and Processes of Isolation of Elements
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Principles and methods of extraction – concentration, oxidation, reduction
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Refining of metals – electrolytic refining, zone refining
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Extraction of aluminium, copper, zinc, and iron
Unit 7 – The p-Block Element (Groups 15, 16, 17, 18)
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Group 15 – Nitrogen family: preparation, properties, and uses of nitrogen and phosphorus
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Group 16 – Oxygen family: preparation, properties, and uses of oxygen and sulphur
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Group 17 – Halogens: preparation, properties, and uses of chlorine
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Group 18 – Noble gases: general properties and uses
Unit 8 – The d-Block Element (Transition Elements)
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General properties of d-block elements
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Electronic configuration
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Occurrence and extraction
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Compounds of transition metals
Unit 9 – The f-Block Element (Lanthanides & Actinides)
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Position in the periodic table
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Electronic configuration
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Oxidation states
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General properties
Unit 10 – Haloalkanes and Haloarenes
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Nomenclature and classification
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Preparation and properties
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Reactions and uses
Unit 11 – Alcohols, Phenols, and Ethers
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Nomenclature and classification
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Preparation and properties
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Reactions and uses
Unit 12 – Aldehydes, Ketones, and Carboxylic Acids
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Nomenclature and structure
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Preparation and properties
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Important reactions
Unit 13 – Amines
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Classification and nomenclature
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Preparation and properties
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Diazonium salts and their uses
Unit 14 – Biomolecules
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Carbohydrates – classification and properties
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Proteins – structure and functions
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Vitamins – types and importance
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Nucleic acids – DNA and RNA
Unit 15 – Polymers
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Classification of polymers
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Addition and condensation polymers
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Copolymerisation
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Natural and synthetic polymers
Unit 16 – Chemistry in Everyday Life
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Chemicals in medicines – analgesics, antibiotics
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Chemicals in food – preservatives, artificial sweeteners
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Cleansing agents – soaps and detergents
Bihar Board Class 12th Chemistry Practical Syllabus
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Volumetric analysis
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Qualitative analysis (identification of ions)
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Salt analysis
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Preparation of organic compounds
FAQs
Bihar Board Class 12th Chemistry Syllabus 2025-2026
Q1. How many units are there in the Bihar Board Class 12 Chemistry syllabus?
Ans: There are a total of 16 units, covering Physical, Organic, and Inorganic Chemistry.
Q2. Is this syllabus helpful for competitive exams?
Ans: Yes, it aligns with major topics for JEE and NEET preparation.
Q3. Does the syllabus include practical exams?
Ans: Yes, there is a 30-mark practical exam including experiments and viva.
Q4. Are there major changes in the 2025-2026 syllabus?
Ans: No major changes, but minor topic updates have been made.
Q5. What is the total marks distribution for Chemistry?
Ans: 70 marks for theory + 30 marks for practicals = 100 marks.
Q6. Are NCERT books sufficient for preparation?
Ans: Yes, NCERT books along with Bihar Board’s prescribed books are enough.
Q7. What type of questions are asked in the exam?
Ans: Multiple choice, short answer, and long answer questions are included.
Q8. Does Organic Chemistry have higher weightage?
Ans: Yes, Organic Chemistry usually carries 30-35% weightage.
Q9. How should I prepare for the practical exam?
Ans: Focus on salt analysis, volumetric analysis, and organic preparation.
Q10. Are diagrams important in Chemistry exams?
Ans: Yes, diagrams such as unit cell structures and reaction mechanisms can fetch extra marks
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