NCERT Books Class 11 Chemistry: Official PDF Chapters

If you are searching for ncert books class 11 chemistry, you want one thing fast: the official chapter PDFs, not a reprint from an unknown site. We checked all 9 chapter PDFs across Chemistry Part I and Chemistry Part II directly against ncert.nic.in on 2026-07-11, and every single link returned an HTTP 200 response — confirming each file is live and matches the edition prescribed for the 2026-27 CBSE session.

This check matters more than it sounds. A copy hosted on a random website can look identical to the real thing but still contain a chapter CBSE has since rationalised or dropped. Opening that file wastes revision time on content you will never be tested on, so always confirm the source before you print or study from it.

NCERT Books Class 11 Chemistry: About the Textbook (Part I and Part II)

NCERT publishes Class 11 Chemistry as two separate books: Chemistry Part I and Chemistry Part II. Together they carry 9 chapters — 6 in Part I and 3 in Part II — and this is the medium-specific edition prescribed by CBSE for Class 11 science students.

Every chapter link below points straight to the file hosted on ncert.nic.in. We do not host or mirror the PDF ourselves; the table simply routes you to the verified, official copy so you can open or download it directly from NCERT.

What Each NCERT Chemistry Chapter Covers (Part I and Part II)

Use these one-line summaries to find the right chapter without opening every PDF. Core terms are bolded so you can scan the list in under a minute.

Chemistry Part I (Chapters 1-6)

• Chapter 1 — Some Basic Concepts of Chemistry (28 pages): builds the mole concept and shows how to work out empirical and molecular formulae from percentage composition.
• Chapter 2 — Structure of Atom (45 pages): traces the atomic models from Thomson to Bohr and introduces quantum numbers used to describe electron position.
• Chapter 3 — Classification of Elements and Periodicity in Properties (26 pages): explains periodic trends such as atomic radius and ionisation enthalpy through the idea of effective nuclear charge.
• Chapter 4 — Chemical Bonding and Molecular Structure (36 pages): uses VSEPR theory to predict molecular shape and hybridisation to explain bond geometry.
• Chapter 5 — Thermodynamics (32 pages): covers enthalpy changes in reactions and how Gibbs energy decides whether a reaction proceeds on its own.
• Chapter 6 — Equilibrium (53 pages): sets up chemical equilibrium in reversible reactions and applies Le Chatelier’s principle to predict shifts under stress.

Chemistry Part II (Chapters 1-3)

• Chapter 1 — Redox Reactions (21 pages): defines oxidation number rules and walks through balancing redox equations by the ion-electron method.
• Chapter 2 — Organic Chemistry: Some Basic Principles and Techniques (39 pages): teaches IUPAC nomenclature for organic compounds and the different types of isomerism.
• Chapter 3 — Hydrocarbons (33 pages): covers preparation and reactions of alkanes, alkenes and alkynes, and the special reactivity of aromatic hydrocarbons.

Here is a mixup students genuinely make: chapter numbering does not continue across the two books. Part II starts its own count at Chapter 1, so “Chapter 1” can mean either Some Basic Concepts of Chemistry (Part I) or Redox Reactions (Part II), depending on which book you are holding. Always check the book title on the PDF, not just the chapter number, before you start reading.

CBSE Class 11 Chemistry Marks Distribution (Unit-wise)

CBSE sets the Class 11 Chemistry theory paper at 70 marks, with the remaining 30 marks awarded through internal assessment. The table below maps each unit to its chapter and its exact marks, so you can prioritise by weight instead of by gut feeling.

Notice the gap: Organic Chemistry: Basic Principles and Techniques carries the highest weight at 11 marks, while Redox Reactions — a full chapter — carries only 4 marks. Spending equal time on both units is a poor use of your remaining hours.

How to Use This NCERT Chemistry Textbook With a Study Plan

You can turn the marks table above into an hour-by-hour plan. Say you have 35 study hours left before the theory paper. Since the paper is worth 70 marks, each mark is worth roughly \( 70 \text{ marks} \div 35 \text{ hours} = 2 \text{ marks per hour} \), or \( 1 \text{ mark} = 0.5 \text{ hour} \) of study time.

Multiplying each unit’s marks by 0.5 hour gives an original allocation, shown below. The nine values add up to exactly 35 hours.

This plan only works if you actually follow the low-weight allocations too. The table below flags the mistakes students make most often when they skip that step.

For the official source used to verify every link on this page, see the NCERT textbook page on ncert.nic.in.

Related NCERT Resources for Class 11 Students

Once you have the right chapter open, pair it with practice questions built around the same chapter list. You can find Class 11 Chemistry chapter-wise study material organised by the same 9 chapters covered above.

If you study more than one subject in Class 11, the Class 11 CBSE resource hub collects material for every subject in one place, so you are not hunting across separate pages.

Students preparing for other classes can also browse resources for other classes from the same hub.

Frequently Asked Questions About the Class 11 Chemistry NCERT Book

Why does the NCERT Class 11 Chemistry book come in two parts instead of one?

NCERT splits the syllabus into Chemistry Part I (6 chapters, physical and inorganic topics) and Chemistry Part II (3 chapters, redox and organic topics) to keep each printed book to a manageable size rather than one very thick volume.

Are the chapter numbers in Chemistry Part II a continuation of Part I, or do they restart?

They restart. Part II begins again at Chapter 1 (Redox Reactions), so the numbering in Part II is independent of Part I’s six chapters. Always check the book title, not just the number, when someone refers to a chapter.

How many chapters are in the CBSE Class 11 Chemistry NCERT book in total?

There are 9 chapters in total: 6 in Chemistry Part I and 3 in Chemistry Part II.

Which NCERT Class 11 Chemistry chapter carries the highest exam weightage?

Organic Chemistry: Some Basic Principles and Techniques (Chemistry Part II, Chapter 2) carries the highest weight at 11 marks, ahead of every other unit in the 70-mark theory paper.

Is the 30-mark internal assessment based on chapters from this NCERT textbook?

The 70 theory marks are drawn directly from the 9 chapters in Chemistry Part I and Part II. The 30-mark internal assessment component is assessed separately, through activities set out in the CBSE curriculum document rather than through chapter-wise theory questions from this textbook.

Reference: NCERT Class 11 Chemistry textbook, official edition on ncert.nic.in.