NCERT Class 11 Chemistry Book Chemistry Part I: What’s Inside Each Chapter

The NCERT Class 11 Chemistry book Chemistry Part I has six chapters across 220 printed pages, and the official PDF of every chapter is in the table directly below. If you came for the textbook file, that table hands it over in one scroll.

What this page adds is a measured map of the book: the named sections, figures and exercise questions of each chapter, counted from the textbook itself, with the page number where each topic begins. You can see where a topic is taught and how heavy a chapter is before you open its PDF.

Download the NCERT Class 11 Chemistry book Chemistry Part I PDF

All six PDFs are NCERT’s own files, hosted on ncert.nic.in. The Chapter 1 file, for example, is the copy NCERT publishes at ncert.nic.in/textbook/pdf/kech101.pdf, so the page numbers and section headings on this page match the file you open.

The book at a glance: six chapters, 220 pages

These are the numbers that describe the whole of Chemistry Part I; the tables on this page let you check each one.

• 6 chapters listed on this page — the complete contents of Chemistry Part I.
• 220 printed pages across the six chapters of the NCERT edition.
• 6 official PDF links, one per chapter, in the table above.
• 161 named section headings in the book.
• 73 verified numbered figures indexed from the textbook.
• 218 exercise questions across the six chapters.
• No separate Activities section in any chapter — the practice load sits entirely in the exercises.

Where the weight sits: Structure of Atom (55 questions) and Equilibrium (59 questions) together carry more than half of the book’s 218 exercise questions.

What’s inside each chapter

In the directory above, a section is one of NCERT’s own numbered headings in the book; a figure is a numbered figure printed in the chapter; a question is an end-of-chapter exercise. None of the six chapters prints a separate Activities section, so that column reads 0 for all of them.

Where to find the topic you were asked about

If you came with a topic in mind, this table shows which chapter answers it.

Chapter 1: Some Basic Concepts of Chemistry (pp. 1–28)

Chemistry as we understand it today is not a very old discipline — yet people in ancient India already understood a good deal of science before modern chemistry began, as the chapter’s SUMMARY notes.

The chapter then supplies the working tools the rest of the book assumes: measurement, units, uncertainty in measurement, the laws of chemical combination, and the mole concept (NCERT, p. 18).

1. 1.1 Importance of Chemistry (p. 4)
2. 1.2 Nature of Matter (p. 4)
3. 1.3 Properties of Matter and Their Measurement (p. 6)
4. 1.4 Uncertainty in Measurement (p. 10)
5. 1.5 Laws of Chemical Combinations (p. 14)
6. 1.6 Dalton’s Atomic Theory (p. 16)
7. 1.7 Atomic and Molecular Masses (p. 16)
8. 1.8 Mole Concept and Molar Masses (p. 18)
9. 1.9 Percentage Composition (p. 18)

With 10 figures and 31 of the book’s 218 exercise questions, it is the chapter that supplies the units, measurement and mole tools every later chapter assumes.

Chapter 2: Structure of Atom (pp. 29–73)

Atoms are the building blocks of elements — the smallest parts of an element that chemically react. The chapter traces how the modern view of the atom was assembled, from Dalton’s indivisible atom through the discovery of electrons, protons and neutrons to the quantum mechanical model (NCERT, p. 53) with its orbitals and quantum numbers.

1. 2.1 Discovery of Sub-Atomic Particles (p. 30)
2. 2.2 Atomic Models (p. 32)
3. 2.3 Developments Leading to the Bohr’s Model of Atom (p. 37)
4. 2.4 Bohr’s Model for Hydrogen Atom (p. 46)
5. 2.5 Towards Quantum Mechanical Model of the Atom (p. 49)
6. 2.6 Quantum Mechanical Model of Atom (p. 53)

With 17 figures and 55 questions, it carries the second-largest exercise load in the book, and the electronic configurations learned here are what Chapter 3’s periodic table is built on.

Chapter 3: Classification of Elements and Periodicity in Properties (pp. 74–99)

The chapter traces the development of the periodic law and the periodic table: Mendeleev ordered elements by atomic mass, while the modern table orders them by atomic number. From there it shows why the properties of elements repeat regularly and how those periodic trends are read across periods and down groups.

1. 3.1 Why Do We Need to Classify Elements? (p. 74)
2. 3.2 Genesis of Periodic Classification (p. 75)
3. 3.3 Modern Periodic Law and the Present Form of the Periodic Table (p. 78)
4. 3.4 Nomenclature of Elements with Atomic Numbers > 100 (p. 78)
5. 3.5 Electronic Configurations of Elements and the Periodic Table (p. 81)
6. 3.6 Electronic Configurations and Types of Elements: S-, P-, D-, F- Blocks (p. 82)
7. 3.7 Periodic Trends in Properties of Elements (p. 85)

At 26 pages with 4 figures and 25 questions, it is the shortest chapter in the book — and the one that leans most directly on the electron configurations from Chapter 2.

Chapter 4: Chemical Bonding and Molecular Structure (pp. 100–135)

Kossel’s insight into bonding was that ions form in order to attain noble gas configurations (NCERT, p. 101) and are then held together by electrostatic attraction. The chapter builds from that starting point to Lewis structures, the octet rule, VSEPR theory, valence bond theory, hybridisation and molecular orbital theory.

1. 4.1 Kössel-Lewis Approach to Chemical Bonding (p. 101)
2. 4.3 Bond Parameters (p. 107)
3. 4.4 The Valence Shell Electron Pair Repulsion (VSEPR) Theory (p. 112)
4. 4.5 Valence Bond Theory (p. 117)
5. 4.6 Hybridisation (p. 120)
6. 4.7 Molecular Orbital Theory (p. 125)
7. 4.8 Bonding in Some Homonuclear Diatomic Molecules (p. 129)
8. 4.9 Hydrogen Bonding (p. 131)

With 21 figures — more than any other chapter — and 26 questions, it is the most diagram-driven chapter in the book, and its 34 named sections are the most of any chapter. Molecular shapes are learned from the figures, so read it with the diagrams open.

Chapter 5: Thermodynamics (pp. 136–167)

The chapter introduces entropy as a state function and a measure of disorder: for a spontaneous change, the total entropy change is positive. It then develops the Gibbs energy criterion for spontaneity, relating the standard Gibbs energy change to the equilibrium constant by \( \Delta_r G^\circ = -RT \ln K \) (NCERT, p. 162).

1. 5.1 Thermodynamic Terms (p. 137)
2. 5.2 Applications (p. 140)
3. 5.3 Measurement of \(\Delta U\) and \(\Delta H\): Calorimetry (p. 145)
4. 5.4 Enthalpy Change, \(\Delta_r H\) of a Reaction – Reaction Enthalpy (p. 146)
5. 5.5 Enthalpies for Different Types of Reactions (p. 152)
6. 5.6 Spontaneity (p. 157)
7. 5.7 Gibbs Energy Change and Equilibrium (p. 162)

With 13 named sections — the fewest of any chapter — 11 figures and 22 questions, it runs a compact course from thermodynamic terms to spontaneity. The Gibbs energy equation it derives is the connection Chapter 6 makes between \(K\) and \(\Delta_r G^\circ\).

Chapter 6: Equilibrium (pp. 168–220)

Equilibrium in a physical process is dynamic: at equilibrium, the number of molecules leaving a liquid as vapour equals the number returning. The chapter carries the same idea into chemical processes through the equilibrium constant, and then into ionic equilibrium in solution — acids and bases (NCERT, p. 189), the pH scale (NCERT, p. 193), buffers and solubility product.

1. 6.1 Equilibrium in Physical Processes (p. 169)
2. 6.2 Equilibrium in Chemical Processes – Dynamic Equilibrium (p. 172)
3. 6.3 Law of Chemical Equilibrium and Equilibrium Constant (p. 174)
4. 6.4 Homogeneous Equilibria (p. 177)
5. 6.5 Heterogeneous Equilibria (p. 179)
6. 6.6 Applications of Equilibrium Constants (p. 181)
7. 6.7 Relationship Between Equilibrium Constant K, Reaction Quotient Q and Gibbs Energy G (p. 184)
8. 6.8 Factors Affecting Equilibria (p. 184)
9. 6.9 Ionic Equilibrium in Solution (p. 188)
10. 6.10 Acids, Bases and Salts (p. 189)

At 53 pages with 41 named sections and 59 questions, it is the largest chapter and the largest question load in the book — close to a quarter of all 218 exercise questions — and it is where most of the volume’s numerical practice sits.

Chapter study pages

Each chapter of this book also has its own study page. The table below shows which ones are ready to open.

How to use the Class 11 CBSE Chemistry book PDF

The six chapters build on each other, so the order below follows the book’s own logic.

1. Chapter 1 first. SI units, significant figures and the mole concept are the tools every later chapter assumes; skip them and the numerical work in Chapters 5 and 6 gets harder.
2. Chapter 2 next. Quantum numbers and electronic configurations are required before the periodic table can make sense.
3. Chapter 3. The modern periodic table and its trends — the bridge between electron configuration and bonding.
4. Chapter 4 with the figures open. 21 of the book’s verified numbered figures sit in this chapter, and VSEPR shapes are learned from them, not from text.
5. Chapter 5. Thermodynamics; the Gibbs energy equation \( \Delta_r G^\circ = -RT \ln K \) returns in Chapter 6.
6. Chapter 6 last and slowest. 53 pages and 59 questions, so leave the most revision time for it.

Use the chapter directory above to jump straight to a topic you were asked about. Keep the numbers in view while you plan: Structure of Atom and Equilibrium together hold more than half of the book’s 218 exercise questions, and that is where long practice runs belong.

One clarification: this book is NCERT’s publication, and the PDFs above are NCERT’s files. “CBSE” appears in the heading only because that is the phrasing students search with — the board prescribes the syllabus, NCERT publishes the textbook.

Related resources

This listing is maintained for the 2026-27 academic session using the NCERT textbook information available to us. NCERT remains the authority for confirming the latest edition.

These are the pages on this site that sit closest to this book.

• All NCERT books on this site — the full directory across classes and subjects.
• The Class 11 NCERT books hub — every Class 11 textbook listed on this site.
• The Class 11 Physics NCERT book — the physics volume students usually take alongside chemistry.
• The Class 11 Mathematics NCERT book — the mathematics text for the same year.

Sources and data verification

• Which edition this page describes: the section titles, figure captions and page references above describe the NCERT Class 11 Chemistry textbook, Part I, in the official edition NCERT publishes on ncert.nic.in.
• What this page covers: the six chapters of Chemistry Part I shown in the tables. It does not cover Chemistry Part II or any other Class 11 subject.
• Session: this listing is maintained for the current academic session using the NCERT editions published on ncert.nic.in.
• Who settles what: NCERT settles textbooks, editions and official PDFs; CBSE settles the curriculum, syllabus and examinations.

Textbook contents and the examinable syllabus are not always identical — check the current official syllabus before deciding what to revise.

Reference: NCERT Class 11 Chemistry textbook (Chemistry Part I), official edition on ncert.nic.in. Figure captions and section titles quoted from the textbook; page references are to the official PDF.

Frequently asked questions

How many chapters are in the NCERT Class 11 Chemistry book Part I?

Six — from Some Basic Concepts of Chemistry (Chapter 1) to Equilibrium (Chapter 6), covering 220 printed pages in the NCERT edition.

Are the Class 11 Chemistry Part I PDFs on this page the official NCERT files?

Yes. Every link in the download table goes to ncert.nic.in, NCERT’s own website, so the file you open is the official published edition.

Which chapter covers the mole concept, and which one covers acids, bases and pH?

The mole concept is taught in Chapter 1 (Section 1.8, p. 18). Acids, bases and salts open in Chapter 6 (p. 189), and the pH scale is introduced on p. 193 of the same chapter.

Where can I find the answers to the Chapter exercises of this book?

The chapter study pages table above links to each chapter’s dedicated page as it becomes available, and the worked answers live there. The NCERT textbook itself prints only the questions, not the solutions.

The Class 11 Chemistry book has a second volume — what does this page cover?

This page covers Chemistry Part I — the six chapters from Some Basic Concepts of Chemistry to Equilibrium. The rest of the course sits in a separate second volume, NCERT Chemistry Class 11 Part 2, which is not covered here.