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Build a JEE Main Chemistry test from any of the 20 units — physical, inorganic or organic — as a full 25-question section with five numericals, a short check after a chapter, or a paper weighted towards the units you keep getting wrong. Chemistry is the section most students can finish fastest, which makes it the cheapest place to gain marks.
Free · no sign-up · updated October 2026
Your paper
Press Generate paper plan for a chapter-by-chapter blueprint: questions per chapter, numericals, marks and time — ready to print and fill from your PYQs, modules or the BrainStride question bank.
Every chapter in the JEE Main Chemistry syllabus, heaviest first. The share column is what a 25-question test gives each chapter in exam-weightage mode, before rounding.
| Chapter | Class | Questions per paper | Share of the subject | The mistake it catches |
|---|---|---|---|---|
| p-Block Elements | 11–12 | 2–3 | 10% | Answering from half-remembered reactions instead of the NCERT line. |
| Chemical Bonding and Molecular Structure | 11 | 1–3 | 8% | Counting lone pairs wrongly, so hybridisation and shape both come out wrong. |
| Chemical Thermodynamics | 11 | 1–2 | 6% | Sign of ΔH and ΔG swapped between system and surroundings. |
| Equilibrium | 11 | 1–2 | 6% | Kp and Kc used interchangeably without the (RT)^Δn conversion. |
| Chemical Kinetics | 12 | 1–2 | 6% | Assuming the order of a reaction from its stoichiometry. |
| Classification of Elements and Periodicity in Properties | 11 | 1–2 | 6% | Quoting a trend without its exception, which is usually what is being asked. |
| d- and f-Block Elements | 12 | 1–2 | 6% | Colour and magnetic-moment questions answered without counting unpaired electrons. |
| Co-ordination Compounds | 12 | 1–2 | 6% | Oxidation state of the metal miscounted, so CFSE and geometry follow it wrong. |
| Some Basic Principles of Organic Chemistry | 11 | 1–2 | 6% | Ranking stability by one effect alone when resonance and inductive effects oppose. |
| Hydrocarbons | 11 | 1–2 | 6% | Markovnikov and anti-Markovnikov products swapped when peroxide is present. |
| Organic Compounds Containing Oxygen | 12 | 1–2 | 6% | Named reactions recalled by name but not by the conditions that trigger them. |
| Principles Related to Practical Chemistry | 11–12 | 1–2 | 6% | Confusing the confirmatory tests for two ions of the same group. |
| Some Basic Concepts in Chemistry | 11 | 0–2 | 4% | Limiting reagent skipped, so the answer follows the reagent that is in excess. |
| Atomic Structure | 11 | 0–2 | 4% | Applying hydrogen-atom energy formulas to multi-electron species. |
| Solutions | 12 | 0–2 | 4% | Van’t Hoff factor left out for electrolytes in colligative property sums. |
| Redox Reactions and Electrochemistry | 11–12 | 0–2 | 4% | Number of electrons transferred (n) taken wrong in the Nernst equation. |
| Biomolecules | 12 | 0–2 | 4% | Answering from a coaching sheet instead of the NCERT text the question is lifted from. |
| Purification and Characterisation of Organic Compounds | 11 | 0–1 | 2% | Empirical formula questions where percentage data is not converted to moles. |
| Organic Compounds Containing Halogens | 12 | 0–1 | 2% | SN1 and SN2 chosen by the substrate alone, ignoring solvent and nucleophile. |
| Organic Compounds Containing Nitrogen | 12 | 0–1 | 2% | Basicity of amines compared in the gas phase and in water without distinguishing them. |
Chapter weights are BrainStride’s reading of past papers, not official data — NTA publishes no chapter weightage. Ranges overlap, so they do not add up exactly to the subject total.
The same 25-question paper twice: once weighted like the exam, once with p-Block Elements and Co-ordination Compounds marked weak. Only the rows that change are shown.
| Chapter | Exam weightage | Weak-chapter mode | Change |
|---|---|---|---|
| Chemical Thermodynamics | 2 | 1 | -1 |
| Equilibrium | 2 | 1 | -1 |
| Chemical Kinetics | 2 | 1 | -1 |
| p-Block Elements | 2 | 5 | +3 |
| Co-ordination Compounds | 1 | 3 | +2 |
| Organic Compounds Containing Halogens | 1 | 0 | -1 |
| Organic Compounds Containing Nitrogen | 1 | 0 | -1 |
Marked chapters get 2.5× their usual share; the questions come from the chapters the paper would otherwise give the most to.
Chemistry is usually the highest-scoring JEE Main section for well-prepared students, and the one where marks are lost most cheaply: an exception in p-Block, a misread reagent, a unit mismatch in a mole calculation.
Test the three branches differently. Physical chemistry (Thermodynamics, Equilibrium, Kinetics, Electrochemistry, Solutions) is numerical and carries most of the section's integer-answer questions — test it under time. Inorganic chemistry (p-Block, d- and f-Block, Co-ordination Compounds, Periodicity) is recall and exceptions — test it often, in short bursts. Organic chemistry is reasoning about mechanisms — test it with mixed questions, because the paper rarely says which reaction it is about.
p-Block is still in the syllabus. The rationalised NCERT books dropped those chapters, but JEE Main still lists p-Block Elements. If your tests keep skipping it because your textbook does, the generator's chapter list will show the gap. Our syllabus changes guide explains which chapters really left.
Use organic as one block. Organic chapters together outweigh any single physical chapter. A weekly test that mixes all the organic units finds the mechanism you cannot recognise out of context — which is how the real paper asks.
The per-unit ranges behind the generator come from our JEE Main Chemistry page; the Thermodynamics and Electrochemistry chapter guides cover two of the numerical-heavy units.
A weekly cycle
Ten questions, equal weighting, only the chapters you finished last week. It tells you whether they stuck.
Concept gaps go back to the textbook; silly errors get accuracy drills on the same chapter; slow solves get timed sets.
Mark the two chapters that cost you most and build a 25-question paper. They get two and a half times their usual share.
A realistic subject paper, scored with +4 / −1, to check the fixes show up when the weighting is fair.
In our reading of past papers, organic chemistry as a block carries the most questions, followed by Chemical Bonding, Co-ordination Compounds, p-Block Elements and the physical chapters Thermodynamics and Electrochemistry. These are BrainStride estimates, given as ranges, because NTA publishes no chapter weightage.
Mostly from physical chemistry — mole concept, thermodynamics, equilibrium, kinetics, electrochemistry and solutions — where answers are numbers rather than options. The generator places the section’s five numericals in the units that carry the most questions, so a full Chemistry test usually puts them in physical and bonding chapters.
p-Block Elements is in the current JEE Main syllabus, even though the rationalised NCERT Chemistry books dropped those chapters, and nothing has been announced that removes it for 2027. Include it in your tests and study it from an older NCERT edition or your coaching module.
Not in the sense of writing questions. The generator is a rule-based planner: it reads the exam pattern and BrainStride’s chapter weights from past papers and decides how many questions each chapter gets, so the result is the same every time for the same settings. The AI part of BrainStride is the tutor, which picks your next practice questions from a teacher-checked bank based on the mistakes you have made.
No. The paper plan is built in your browser, nothing is sent to a server and there is no sign-up. Print it or copy it as text if you want to keep it. The free BrainStride diagnostic is a separate, optional step if you want a plan built around your own mistakes.
Exam patterns are from the official information bulletins. Chapter weights are BrainStride estimates from past papers, not official data.
The 20-minute diagnostic names them — then every practice set and every generated test can lean on them.