NEET UG · subject
NEET Chemistry preparation, chapter by chapter
Chemistry is 45 of the 180 questions in NEET UG and 180 of the 720 marks, and it is the most NCERT-dependent subject after Biology — which makes it the most recoverable. This page ranks every unit by weightage, separates what you must recall from what you must reason through, and names the mistake each unit usually catches. BrainStride is an AI tutor for JEE, NEET and Olympiad preparation that runs a 20-minute diagnostic, maps your weak chapters and writes a daily plan, with every solution checked by teachers.
Quick answer
- NEET Chemistry has 45 compulsory questions worth 180 of the 720 marks, marked +4 and −1.
- Physical, Inorganic and Organic split the paper roughly evenly, with Organic units such as oxygen-containing compounds (3–5 Q) and Inorganic p-Block (3–5 Q) among the heaviest.
- Most Chemistry questions are answerable from NCERT lines and reactions, which is why accuracy here is cheaper to buy than in Physics.
- NTA publishes no chapter weightage: every count here is BrainStride’s analysis of past papers, written as a range.
The ten heaviest Chemistry units
Question counts are BrainStride’s analysis of recent NEET papers, not official figures — NTA publishes no chapter weightage. Average questions per paper, most recent sessions.
Every NEET Chemistry unit
All 20 units of the NEET Chemistry syllabus, grouped as the official syllabus groups them into Physical, Inorganic and Organic chemistry.
| Unit | Class | Typical questions | What it tests | The mistake it catches |
|---|---|---|---|---|
| 1. Some Basic Concepts in Chemistry | 11 | 1–2 Q | Calculation | Swapping molarity and molality when the solvent mass changes. |
| 2. Atomic Structure | 11 | 2–3 Q | Recall + calculation | Applying Bohr model formulas to multi-electron atoms. |
| 3. Chemical Bonding and Molecular Structure | 11 | 3–5 Q | Concept-heavy | Counting lone pairs, then ignoring them when naming the shape. |
| 4. Chemical Thermodynamics | 11 | 1–3 Q | Sign conventions | Reversing the sign of ΔH for a reversed reaction but not scaling it when multiplied. |
| 5. Solutions | 12 | 1–3 Q | Calculation | Leaving out the van ’t Hoff factor for electrolytes in colligative property sums. |
| 6. Equilibrium | 11 | 2–3 Q | Application | Using concentrations where Kp needs partial pressures. |
| 7. Redox Reactions and Electrochemistry | 11–12 | 2–3 Q | Calculation | Dropping n from the Nernst equation, or balancing a half-reaction in the wrong medium. |
| 8. Chemical Kinetics | 12 | 1–2 Q | Calculation | Using the first-order half-life formula for a reaction that is not first order. |
| 9. Classification of Elements and Periodicity in Properties | 11 | 1–3 Q | Recall + reasoning | Quoting the general trend when the question is built on the exception. |
| 10. p-Block Elements | 11–12 | 3–5 Q | Recall-heavy | Learning a reaction without its conditions, so the product is right and the reagent wrong. |
| 11. d- and f-Block Elements | 12 | 1–3 Q | Recall | Comparing 4d and 5d radii without the lanthanoid contraction. |
| 12. Co-ordination Compounds | 12 | 2–4 Q | Recall + reasoning | Reading coordination number off the formula without counting bidentate ligands twice. |
| 13. Purification and Characterisation of Organic Compounds | 11 | 1–2 Q | Recall | Matching a separation technique to the wrong kind of impurity. |
| 14. Some Basic Principles of Organic Chemistry | 11 | 2–3 Q | Reasoning | Ranking stability on inductive effect alone and ignoring resonance. |
| 15. Hydrocarbons | 11 | 2–3 Q | Reaction recall | Applying Markovnikov addition when a peroxide is in the question. |
| 16. Organic Compounds Containing Halogens | 12 | 1–3 Q | Mechanism | Choosing SN1 or SN2 from the substrate alone, ignoring the solvent. |
| 17. Organic Compounds Containing Oxygen | 12 | 3–5 Q | Reaction recall | Using a named reaction that needs an aldehyde with no α-hydrogen on one that has them. |
| 18. Organic Compounds Containing Nitrogen | 12 | 1–3 Q | Reaction recall | Ordering amine basicity in water as though it were the gas phase. |
| 19. Biomolecules | 12 | 2–3 Q | Recall | Blurring the NCERT classification of carbohydrates, proteins and vitamins. |
| 20. Principles Related to Practical Chemistry | 11–12 | 1–2 Q | Recall | Forgetting the confirmatory test that separates two ions in the same group. |
Ranges overlap and are rounded, so chapter ranges do not add up exactly to a unit or subject total. Counts shift by a question or two every year.
How should you split Physical, Inorganic and Organic chemistry?
Roughly evenly, but not with the same method. Physical chemistry is calculation: the marks come from doing the same twenty question types until the arithmetic stops slipping. Inorganic is recall with conditions attached — a reaction remembered without its reagent or temperature is worth nothing in a four-option question. Organic sits between the two: mechanisms reason, named reactions recall.
In practice, most students under-prepare Inorganic because it feels like reading rather than studying, then lose 3–5 Q on p-Block alone.
Is NCERT enough for NEET Chemistry?
For Inorganic and much of Organic, NCERT is not just enough — it is the source. Questions are written from its lines, tables and exercise problems, including the small print under a diagram. For Physical chemistry, NCERT gives the concepts but too few numericals, so add timed practice per chapter.
Read NCERT actively: cover the table, recall the trend, then check. Passive re-reading is what produces the feeling of knowing a chapter that a mock does not confirm.
What is the fastest way to revise reactions?
One page per chapter, written by you, with reagent and conditions beside every arrow — then rewrite it from memory a week later and compare. Chapters you cleared in June resurface in October in a spaced revision plan for exactly this reason. Check the unit list against the NEET syllabus so nothing quietly falls off your sheet.
The five Chemistry mistakes that repeat
Patterns our subject mentors see most often — illustrative, not measured. Sample observations; replace with measured data before launch.
Reactions learned without conditions
Why it happens
The product is remembered, the reagent and temperature are not — and the options are built from exactly that confusion.The fix
Write every reaction as reagent, conditions, product. If you cannot say the conditions aloud, the reaction is not learned.Mole concept slips under time
Why it happens
Molarity and molality, or grams and moles, get swapped in the first line and the rest of the working is wasted.The fix
Write what is given with units before calculating, and check the denominator: solution volume for molarity, solvent mass for molality.Shape and geometry confused
Why it happens
Lone pairs are counted for the geometry, then forgotten when the shape is named.The fix
Count bond pairs and lone pairs separately, name the electron geometry first, then the molecular shape.Guessing on recall questions
Why it happens
Inorganic questions feel close enough to guess, and −1 quietly undoes the marks earned elsewhere.The fix
Rule out two options before you answer. If you cannot, leave it: a blank is 0 and a wrong answer is −1.NCERT exercises skipped
Why it happens
They look easy beside coaching modules, so they get postponed to a revision that never happens.The fix
Do the exercises chapter by chapter as you finish the chapter, including the in-text questions and the tables.Where to go after NEET Chemistry
Everything here is free and open — no sign-up needed for the tools.
- SubjectNEET PhysicsThe 45 calculation questions where most ranks are lost.
- SubjectNEET BiologyThe 90 questions that decide the rank.
- SyllabusNEET syllabus, unit by unitEvery unit mapped to its NCERT chapter, with what changed.
- PatternNEET exam pattern and marking180 questions, 720 marks, +4 and −1 — and what that does to guessing.
- ToolSyllabus trackerTick off all 72 NEET chapters and see what is left.
- ToolNEET score calculatorCorrect and incorrect counts per subject, scored the way NTA scores them.
- ToolNEET rank predictorMarks to an all-India rank band, with the qualifying check for your category.
- CutoffsNEET qualifying marks by categoryWhat 2023, 2024 and 2025 actually needed, and why 2025 moved.
How the Chemistry content here is checked
Every solution is reviewed by a subject teacher before it ships, explanations are audited weekly, and a one-tap report sends any question straight to a mentor.
Read the editorial policy- Reviews the NEET Chemistry solution bank before release
- Audits organic mechanism explanations weekly
- Weightage ranges come from our own reading of past papers, never from an official source that does not publish them.
- Report anything that looks wrong and it is fixed or explained within 48 hours.
NEET Chemistry: common questions
How many questions come from Chemistry in NEET UG?
NEET UG Chemistry has 45 compulsory questions worth 180 of the paper’s 720 marks, under the pattern used since 2025. Each correct answer earns +4 and each wrong answer costs −1. The split between Physical, Inorganic and Organic chemistry moves a little each year, so plan for all three rather than betting on one.
Which chapters are most important in NEET Chemistry?
In recent NEET papers, organic compounds containing oxygen (3–5 Q), p-Block Elements (3–5 Q), Chemical Bonding (3–5 Q) and Co-ordination Compounds (2–4 Q) carry the most questions. These are BrainStride’s estimates from past papers, given as ranges, because NTA publishes no official chapter weightage for NEET UG.
Is NCERT enough for NEET Chemistry?
For Inorganic and much of Organic chemistry, NCERT is the source the questions are written from, down to the tables and the lines under diagrams. For Physical chemistry it gives the concepts but too few numericals, so add timed chapter-wise practice. Reading NCERT actively — recalling before checking — matters more than how many times you read it.
Which NCERT edition should I study from for NEET Chemistry?
Use the current NCERT Class 11 and 12 Chemistry books, and check them against the official NEET syllabus published by the NMC, because a unit in the syllabus is examinable even where the rationalised textbook trimmed it. Our NEET syllabus page lists every unit; confirm anything doubtful in the official document before dropping a topic.
How do I revise Organic chemistry reactions before NEET?
Keep one page per chapter with reagent, conditions and product beside every arrow, and rewrite it from memory a week later rather than re-reading it. Mechanisms should be reasoned, not memorised: if you can say why the electrophile attacks where it does, the named reactions built on it stop needing separate storage.
How much time should Chemistry take in the NEET paper?
Most students who finish comfortably spend roughly 40–50 of the 180 minutes on Chemistry, because recall questions should be quick and Physical chemistry numericals are short. If Chemistry is eating an hour, the cause is usually unfinished Inorganic recall rather than slow calculation — which is a revision problem, not a speed problem.
Official sources
- NEET UG — National Testing Agency (information bulletin and syllabus)neet.nta.nic.in
- National Medical Commission — NEET UG syllabuswww.nmc.org.in
- NCERT textbooks, Class 11 and 12ncert.nic.in/textbook.php
Pattern and marking facts on this page follow the NEET UG pattern used since 2025. Confirm the 2027 details in the official bulletin when it is released.
Which Chemistry units are quietly costing you 40 marks?
The 20-minute diagnostic names them, then writes the plan that closes them. Free, no card.
Chapter guides for this subject
Formulas, the mistakes that cost marks, worked examples and a quiz — free, no account.