Aakash Repeater Courses
Take Aakash iACST and get instant scholarship on coaching programs.
Assam HS (12th) Chemistry Syllabus 2025-26 PDF (Out): AHSEC Unit-wise Topics, Marks Distribution
The Assam Higher Secondary Education Council has prescribed the AHSEC Chemistry syllabus 2025-26. Students can access and download the Assam AHSEC syllabus 2025-26 for the Chemistry subject from the official website at ahsec.assam.gov.in. They can find the Chemistry syllabus in PDF format, unit-wise and prepare for the board examination following the syllabus topics.
This Story also Contains
- Assam AHSEC Chemistry Syllabus 2025-26: Titles & Marks Distribution
- Detailed AHSEC Chemistry Syllabus 2025-26: Unit-Wise
- Detailed AHSEC Assam Chemistry Practical Exam Syllabus 2025-26
The board conducts the Assam AHSEC exam for 100 marks, out of which 70 marks are allotted for the theory and 30 marks for the practical exam. Students must score a minimum of 30 marks to pass the AHSEC board examination. Read the article to learn more about the AHSEC Assam Chemistry syllabus 2025-26.
Assam AHSEC Chemistry Syllabus 2025-26: Titles & Marks Distribution
Units | Unit Title | 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 |
Detailed AHSEC Chemistry Syllabus 2025-26: Unit-Wise
Students can check out the following Assam HS syllabus 2025-26 for the Chemistry subject. The Assam AHSEC board has prescribed the syllabus in detail, and candidates need to prepare thoroughly to score well in the board examination. The following syllabus is as per the latest academic year 2025-26. Check out the sections below.
Unit 1: Solutions
Types of solutions, expression of concentration of solutions of solids in liquids, solubility of gases in liquids, solid solutions, Raoult's law, colligative properties - relative lowering of vapour pressure, elevation of boiling point, depression of freezing point, osmotic pressure, determination of molecular masses using colligative properties, abnormal molecular mass, Van't Hoff factor.
Unit 2: Electrochemistry
Redox reactions, EMF of a cell, standard electrode potential,
Nernst equation and its application to chemical cells,
Relation between Gibbs energy change and EMF of a cell, conductance in electrolytic solutions, specific and molar conductivity, variations of conductivity with concentration.
Kohlrausch's Law, electrolysis and the law of electrolysis (elementary idea), dry electrolytic cells and Galvanic cells, lead accumulator, fuel cells, corrosion.
Unit 3: Chemical Kinetics
Rate of a reaction (Average and instantaneous), factors affecting rate of reaction: concentration, temperature, catalyst; order and molecularity of a reaction, rate law and specific rate constant, integrated rate equations and half-life (only for zero and first order reactions), concept of collision theory (elementary idea, no mathematical treatment), activation energy, Arrhenius equation.
Unit 4: d and f Block Elements
General introduction, electronic configuration, occurrence and characteristics of transition metals, general trends in properties of the first-row transition metals – metallic character, ionisation enthalpy, oxidation states, ionic radii, colour, catalytic property, magnetic properties, interstitial compounds, alloy formation, preparation and properties of K2Cr2O7 and KMnO4.
Lanthanoids - Electronic configuration, oxidation states, chemical reactivity and lanthanoid contraction and its consequences.
Actinoids - Electronic configuration, oxidation states and comparison with lanthanoids.
50+ Entrance Exams for 10+2 Students Must Not Miss
Download this ebook to learn about 50+ entrance exams for 12th students to get admission to the best colleges for undergraduates.
Download EBookUnit 5: Coordination Compounds
Coordination compounds - Introduction, ligands, coordination number, colour, magnetic properties and shapes, IUPAC nomenclature of mononuclear coordination compounds. Bonding, Werner's theory, VBT, and CFT; structure and stereoisomerism, importance of coordination compounds (in qualitative analysis, extraction of metals and biological systems).
Unit 6: Haloalkanes and Haloarenes
Haloalkanes: Nomenclature, nature of C–X bond, physical and chemical properties, optical rotation mechanism of substitution reactions.
Haloarenes: Nature of C–X bond, substitution reactions (Directive influence of halogen in monosubstituted compounds only).
Uses and environmental effects of dichloromethane, trichloromethane, tetrachloromethane, iodoform, freons, DDT.
Unit 7: Alcohols, Phenols and Ethers
Alcohols: Nomenclature, methods of preparation, physical and chemical properties (of primary alcohols only), identification of primary, secondary and tertiary alcohols, mechanism of dehydration, uses with special reference to methanol and ethanol.
Phenols: Nomenclature, methods of preparation, physical and chemical properties, acidic nature of phenol, electrophilic substitution reactions, uses of phenols.
Ethers: Nomenclature, methods of preparation, physical and chemical properties, uses.
Unit 8: Aldehydes, Ketones and Carboxylic Acids
Aldehydes and Ketones: Nomenclature, nature of the carbonyl group, methods of preparation, physical and chemical properties, mechanism of nucleophilic addition, reactivity of alpha hydrogen in aldehydes, uses.
Carboxylic Acids: Nomenclature, acidic nature, methods of preparation, physical and chemical properties; uses.
Unit 9: Amines
Amines: Nomenclature, classification, structure, methods of preparation, physical and chemical properties, uses, identification of primary, secondary and tertiary amines.
Diazonium salts: Preparation, chemical reactions and importance in synthetic organic chemistry.
Unit 10: Biomolecules
Carbohydrates - Classification (aldoses and ketoses), monosaccharides (glucose and fructose), D-L configuration oligosaccharides (sucrose, lactose, maltose), polysaccharides (starch, cellulose, glycogen); Importance of carbohydrates.
Proteins - Elementary idea of - amino acids, peptide bond, polypeptides, proteins, structure of proteins - primary, secondary, tertiary structure and quaternary structures (qualitative idea only), denaturation of proteins, enzymes. Hormones - Elementary idea, excluding structure.
Vitamins - Classification and functions.
Nucleic Acids: DNA and RNA.
Assam HS Chemistry Practical Exam Marks Distribution 2025-26
Evaluation Scheme for Examination | Marks |
Volumetric Analysis | 6 |
Salt Analysis | 12 |
Content-Based Experiment | 4 |
Project Work | 4 |
Class record and viva | 4 |
Total | 30 |
Detailed AHSEC Assam Chemistry Practical Exam Syllabus 2025-26
Recommended eBooks
Related eBooks & Sample Papers
Articles
Related Stories
|
Upcoming School Exams
Certifications By Top Providers
Explore Top Universities Across Globe
University of Essex, Colchester
Wivenhoe Park Colchester CO4 3SQUniversity College London, London
Gower Street, London, WC1E 6BTThe University of Edinburgh, Edinburgh
Old College, South Bridge, Edinburgh, Post Code EH8 9YLUniversity of Delaware, Newark
Newark, DE 19716University of Nottingham, Nottingham
University Park, Nottingham NG7 2RDBristol Baptist College, Bristol
The Promenade, Clifton Down, Bristol BS8 3NJQuestions related to Assam AHSEC
On Question asked by student community
Have a question related to Assam AHSEC ?
The AHSEC 12th Exam is the Higher Secondary (HS) Final Examination conducted by the Assam Higher Secondary Education Council for students in Class 12 across various streams like Science, Commerce, Arts, and Vocational in the state of Assam.
If you missed the Assam AHSEC exam due to genuine medical emergency then you must contact your respective school authorities and talk to the Assam board immediately. Other than that, you will have to submit a medical certificate and an application for proof. After that, the board will decide and might allow you to take the special exam.
Yes, the Assam HS (Higher Secondary) exam will be held in 2025 from February 13 to March 17. Assam HS exams will be conducted in two shifts: morning (9:00 AM to 12:00 PM) and afternoon (1:30 PM to 4:30 PM).
No, students are not allowed to sit for the Assam HS exam without the admit card. The Assam board releases the Assam AHSEC admit card on the official website, ahsec.assam.gov.in, you can login and download it or you can also contact your respective school authorities directly for a replacement.
Hello,
The eligibility for engineering candidates are 1) they must have scored at least 60% in class 12. 2) Candidates must have completed their 12th in science stream with maths, physics and chemistry as a part of their subjects.
You do not need to reappear for all the exams. You can appear only for the subjects that are main in the eligibility for engineering. The main subjects are Physics, Chemistry and Maths. You can appear for these examinations only and also if you are sure that these subjects plus the other subjects included will give you a percentage of more than 60% then you don't have to give any other exam.
I hope this helps,
All the best
Study Resources, Applications and Opportunities
Aakash Repeater Courses
ApplyTake Aakash iACST and get instant scholarship on coaching programs.
NEET Most scoring concepts
Get nowThis ebook serves as a valuable study guide for NEET 2025 exam.
NEET Previous 10 Year Questions
Get nowThis e-book offers NEET PYQ and serves as an indispensable NEET study material.
JEE Main Important Physics formulas
Get nowAs per latest syllabus. Physics formulas, equations, & laws of class 11 & 12th chapters
JEE Main Important Chemistry formulas
Get nowAs per latest syllabus. Chemistry formulas, equations, & laws of class 11 & 12th chapters
JEE Main high scoring chapters and topics
Get nowAs per latest 2024 syllabus. Study 40% syllabus and score upto 100% marks in JEE
Assam AHSEC Notifications
Never miss an Assam AHSEC update
Get timely Assam AHSEC updates directly to your inbox. Stay informed!