NCERT Exemplar Class 11 Chemistry Chapter 2 Structure of Atom PDF
eSaral Academic and Editorial Team
Summary
NCERT Exemplar Class 11 Chemistry Chapter 2, Structure of Atom, has 55 practice questions: 16 MCQs (Type-I), 5 MCQs (Type-II), 20 short answer, 6 matching, 3 assertion-reason and 5 long answer questions, with answers at the end of the chapter. It covers subatomic particles, atomic models, the photoelectric effect, Bohr's model, dual nature, the uncertainty principle, quantum numbers and electronic configuration. Download the free 2025-26 PDF below.
Structure of Atom is one of the most important chapters of Class 11 Physical Chemistry. It builds the base for periodic properties, chemical bonding and many numericals in JEE and NEET. The NCERT Exemplar Class 11 Chemistry Chapter 2 gives you higher-level practice than the textbook exercises, so solve it after finishing the NCERT chapter.
Download NCERT Exemplar Class 11 Chemistry Chapter 2 PDF
Download NCERT Exemplar Class 11 Chemistry Chapter 2 Structure of Atom PDF (2025-26)
This NCERT Exemplar Structure of Atom Class 11 PDF is the 2025-26 reprint and has 13 pages: questions on pages 1 to 10 and answers on pages 11 to 13. You can also read all pages below.
NCERT Exemplar Class 11 Chemistry Chapter 2 Question Pattern
Section | Question Numbers | Number of Questions |
|---|---|---|
I. Multiple Choice Questions (Type-I), one correct option | 1–16 | 16 |
II. Multiple Choice Questions (Type-II), one or more correct options | 17–21 | 5 |
III. Short Answer Type | 22–41 | 20 |
IV. Matching Type | 42–47 | 6 |
V. Assertion and Reason Type | 48–50 | 3 |
VI. Long Answer Type | 51–55 | 5 |
Total | 55 |
Answers to all 55 questions, including hints for the numericals, are given at the end of the PDF.
Structure of Atom NCERT Exemplar – Topics Covered
Topic | What the Exemplar Questions Test |
|---|---|
Subatomic particles | Cathode rays, discovery of electron, proton and neutron, charge-to-mass ratio |
Atomic models | Thomson and Rutherford models, α-particle scattering, drawbacks of Rutherford's model |
Isotopes and isobars | Atomic number, mass number, chemical behaviour of isotopes |
Electromagnetic radiation | Wavelength, frequency, wave number, black body radiation |
Photoelectric effect | Threshold frequency, work function, kinetic energy of ejected electrons |
Bohr's model and hydrogen spectrum | Energy of orbits, Rydberg formula, Lyman and Balmer series |
Dual nature of matter | de Broglie wavelength of electrons and other particles |
Heisenberg's uncertainty principle | Uncertainty in position and velocity |
Quantum mechanical model | Quantum numbers, shapes of s, p and d orbitals, radial and angular nodes, probability density |
Electronic configuration | Aufbau principle, Pauli exclusion principle, Hund's rule, stability of half-filled and completely filled orbitals |
Important Formulas for Structure of Atom
These formulas are used in most numericals of the NCERT Exemplar Class 11 Chemistry Chapter 2.
Concept | Formula |
|---|---|
Speed of light | c = νλ |
Energy of a photon | E = hν = hc/λ |
Photoelectric effect | hν = hν₀ + ½mv² |
Energy of nth orbit (hydrogen) | Eₙ = –2.18 × 10⁻¹⁸ (Z²/n²) J |
Radius of nth orbit (hydrogen) | rₙ = 52.9 (n²/Z) pm |
Wave number of spectral lines | ν̄ = 109677 (1/n₁² – 1/n₂²) cm⁻¹ |
de Broglie wavelength | λ = h/mv |
Heisenberg's uncertainty principle | Δx × Δp ≥ h/4π |
Total nodes / radial nodes | n – 1 / n – l – 1 |
How to Solve NCERT Exemplar Class 11 Chemistry Chapter 2
- Finish the NCERT chapter first. Read Structure of Atom and solve the textbook exercises before starting the Exemplar.
- Start with the MCQs. The 21 MCQs test concepts like Rutherford's experiment, quantum numbers and electronic configuration.
- Practise numericals daily. Short answer and long answer questions on Bohr's model, the photoelectric effect and de Broglie wavelength need formula practice.
- Do the matching and assertion-reason questions carefully. They test exact understanding, not memory.
- Check every answer with the answer key at the end of the PDF, and revise the topics where you made mistakes.
For chapter revision, use the Class 11 Chemistry Chapter 2 notes on Structure of Atom, and for textbook answers, see NCERT Solutions Class 11 Chemistry Chapter 2.
Also Read:
- Class 11 Chemistry Revision Notes
- NCERT Class 11 Chemistry Book
- CBSE Class 11 Chemistry Syllabus
- NCERT Exemplar Class 11 Physics PDF – All Chapters
- NCERT Exemplar Class 11 Chemistry PDF – All Chapters
- NCERT Exemplar Class 11 Biology PDF – All Chapters
- NCERT Exemplar Class 11 Maths PDF – All Chapters
To watch free learning videos on Class 11 Chemistry by Kota's top faculty, install the eSaral App.
Frequently Asked Questions
What does NCERT Exemplar Class 11 Chemistry Chapter 2 cover?
NCERT Exemplar Class 11 Chemistry Chapter 2, Structure of Atom, covers subatomic particles, Thomson and Rutherford models, electromagnetic radiation, the photoelectric effect, Bohr's model, the hydrogen spectrum, dual nature of matter, Heisenberg's uncertainty principle, quantum numbers, orbitals and electronic configuration.
How many questions are there in NCERT Exemplar Class 11 Chemistry Chapter 2?
There are 55 questions: 16 MCQs (Type-I), 5 MCQs (Type-II), 20 short answer, 6 matching, 3 assertion-reason and 5 long answer questions. Answers are given at the end of the chapter, and eSaral gives the full 2025-26 PDF on this page.
Where can I find structure of atom class 11 NCERT exemplar solutions?
The answers and hints for all questions are printed at the end of the Exemplar chapter itself (pages 11 to 13 of the PDF). For step-by-step textbook answers, use eSaral's NCERT Solutions for Class 11 Chemistry Chapter 2.
Is the Structure of Atom NCERT Exemplar important for JEE and NEET?
Yes. Structure of Atom is the base for periodic properties and chemical bonding, and questions on Bohr's model, quantum numbers, de Broglie wavelength and electronic configuration are common in JEE Main and NEET. The Exemplar MCQs and numericals are good practice before moving to previous year questions.
Is NCERT Exemplar enough for JEE Main Chemistry?
NCERT Exemplar builds strong concepts but is not enough on its own for JEE Main. After the Exemplar, practise previous year JEE questions and topic-wise tests. eSaral's faculty recommend finishing the textbook and Exemplar first, then moving to JEE-level practice.
Can I download the Structure of Atom exemplar PDF for free?
Yes. NCERT Exemplar books are free. You can download the Chapter 2 PDF (2025-26) from the link on this page or from the official NCERT website, ncert.nic.in.
Team eSaral
eSaral Academic and Editorial Team
Team eSaral is the collective author profile for educational content created by eSaral’s teachers and academic contributors. The team draws on expertise from IIT graduates, doctors, experienced educators and subject specialists to develop resources for JEE, NEET and school students. Our articles aim to explain concepts clearly and help students study with confidence.
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