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Many JEE aspirants plan chemistry by NCERT chapter, juggling two years of textbooks. The official JEE Main syllabus groups the same content into 20 units, which is a cleaner map to plan from. This post sets out how those units are organised, which ones carry calculations, three worked examples, and a way to plan your weeks.
How is the JEE Main chemistry syllabus organised?
The Syllabus for JEE (Main) 2026 divides chemistry into three sections and 20 units:
Physical chemistry, Units 1 to 8: Some Basic Concepts in Chemistry; Atomic Structure; Chemical Bonding and Molecular Structure; Chemical Thermodynamics; Solutions; Equilibrium; Redox Reactions and Electrochemistry; Chemical Kinetics.
Inorganic chemistry, Units 9 to 12: Classification of Elements and Periodicity in Properties; p-Block Elements (Groups 13 to 18); d- and f-Block Elements; Coordination Compounds.
Organic chemistry, Units 13 to 20: Purification and Characterisation of Organic Compounds; Some Basic Principles of Organic Chemistry; Hydrocarbons; Organic Compounds Containing Halogens; Organic Compounds Containing Oxygen; Organic Compounds Containing Nitrogen; Biomolecules; Principles Related to Practical Chemistry.
Two details are worth noticing. There is no separate unit for s-block elements or hydrogen; the s-block appears only within Unit 9's description of the periodic table. And Unit 20 is all lab chemistry: salt analysis, titrations such as oxalic acid against KMnO₄, and preparations such as Mohr's salt and potash alum. Check the syllabus for your exam year, because NTA publishes a new one each cycle.
How many chemistry questions are there, and of what type?
The JEE (Main) 2026 Information Bulletin gives each subject in Paper 1 20 multiple-choice questions in Section A and 5 numerical-value questions in Section B, for 100 marks. Both sections carry +4 for a correct answer and −1 for a wrong one, and numerical answers are rounded to the nearest integer.
The bulletin does not publish marks per unit, so treat any claimed "unit weightage" as an estimate from past papers, not an official figure. What the syllabus does tell you is which units are built around calculation. Every physical chemistry unit, from 1 to 8, names something to calculate, such as stoichiometry, lattice enthalpy, enthalpies of reaction, colligative properties, equilibrium constants, cell potential with the Nernst equation, and half-lives. Unit 13 also lists numerical problems in organic quantitative analysis. These are the natural home of numerical-value questions.
Worked example 1: Unit 1, the mole
How many molecules are in 4.4 g of CO₂? (Take N_A = 6.022 × 10²³ mol⁻¹.)
Molar mass of CO₂ = 12 + 2 × 16 = 44 g mol⁻¹.
Moles = 4.4 / 44 = 0.1 mol.
Molecules = 0.1 × 6.022 × 10²³ = 6.022 × 10²² molecules.
Common mistake: counting atoms instead of molecules. Each molecule has 3 atoms, so 0.1 mol of CO₂ has 1.807 × 10²³ atoms. Read which one the question asks for. More traps are in our post on mole concept errors.
Worked example 2: Unit 8, half-life
A first-order reaction has k = 0.0693 min⁻¹. How long does it take to be 87.5% complete, in minutes?
For first order, t½ = 0.693 / k = 0.693 / 0.0693 = 10 min.
87.5% complete means 12.5% is left, which is 1/8 = (1/2)³.
That is 3 half-lives: 3 × 10 = 30 min. Answer: 30.
Common mistake: thinking 87.5% is "almost 100%, so about 2 half-lives". Write the fraction left as a power of 1/2. See our guide to chemical kinetics and rate laws for zero-order cases.
Worked example 3: Unit 5, freezing point depression
0.1 mol of NaCl is dissolved in 1 kg of water. Find the depression in freezing point, taking K_f = 1.86 K kg mol⁻¹ and complete dissociation.
Molality m = 0.1 mol / 1 kg = 0.1 mol kg⁻¹.
NaCl gives Na⁺ and Cl⁻, so the van't Hoff factor i = 2.
ΔT_f = i × K_f × m = 2 × 1.86 × 0.1 = 0.372 K.
Common mistake: leaving out i, which halves the answer. Our post on colligative properties covers incomplete dissociation and association.
How should you plan your weeks around the units?
The most useful study techniques for this kind of material are well documented. A large review by Dunlosky and colleagues rated practice testing and distributed practice as high-utility techniques, and rereading and highlighting as low utility.
Make a 20-row checklist from the syllabus, one row per unit, with columns for "concepts done", "numericals done" and "mixed test done".
Pair one physical unit with one inorganic or organic unit each week, so you do calculations and recall side by side.
Daily: five numericals from any physical unit already covered, rounded to an integer as in Section B.
Twice a week: a 20-minute recall test on reactions or trends from memory, then check against NCERT.
Every fourth week: a mixed test across all units done so far.
When a concept behind a unit is unclear, the Fermi Concept Library covers every concept in physics, chemistry, biology, mathematics and computing, so you can read it explained a second way.
Print the syllabus today and build your 20-row checklist before you start the next chapter.
