Last Updated on June 16, 2025 by XAM CONTENT
Mastering the important concepts in Class 11 Chemistry Chapter 2 – Structure of Atom is essential for scoring high marks in your exams. That’s why we’ve put together chapterwise multiple-choice questions (MCQs) with answers to help you revise effectively and boost your confidence. It is a part of MCQ Questions for CBSE Class 11 Chemistry Series.
These multiple-choice questions will help you assess your knowledge, improve accuracy, and boost confidence for your exams. Whether you are preparing for school tests, online tests or competitive exams, these Structure of Atom MCQs will strengthen your conceptual clarity.
| Chapter | Structure of Atom |
| Book | Chemistry for Class 11 |
| Type of Questions | MCQ Questions |
| Nature of Questions | Competency Based Questions |
| Board | CBSE |
| Class | 11 |
| Subject | Chemistry |
| Useful for | Class 11 Studying Students |
| Answers provided | Yes |
| Difficulty level | Mentioned |
| Important Link | Class 11 Chemistry Chapterwise MCQ Questions |
MCQ Questions on Structure of Atom Class 11 Chemistry (PDF Download)
MCQs
Q1. Which of the following experiments led to the discovery of the nucleus in an atom?
(a) Cathode ray experiment
(b) Gold foil experiment
(c) Oil drop experiment
(d) Discharge tube experiment
Show Answer
Answer: (b)
Explanation: Rutherford’s gold foil experiment revealed the presence of a dense, positively charged nucleus at the center of the atom.
Q2. The energy of a photon is 3.0 × 10-19 J. What is its frequency? (Planck’s constant, h = 6.63 × 10-34 J·s)
(a) 4.52 × 1014 Hz
(b) 5.24 × 1014 Hz
(c) 3.02 × 1015 Hz
(d) 6.02 × 1015 Hz
Show Answer
Answer: (b)
Explanation: E = hν → ν = E/h = 3.0 × 10-19 / 6.63 × 10-34 = 5.24 × 1014 Hz.
Q3. Which spectral series of hydrogen lies in the visible region?
(a) Lyman
(b) Balmer
(c) Paschen
(d) Brackett
Show Answer
Answer: (b)
Explanation: The Balmer series corresponds to electron transitions ending at n=2 and lies in the visible spectrum.
Q4. Which quantum number differentiates orbitals in a subshell?
(a) Principal quantum number
(b) Azimuthal quantum number
(c) Magnetic quantum number
(d) Spin quantum number
Show Answer
Answer: (c)
Explanation: The magnetic quantum number (m) specifies the orientation of orbitals within a subshell.
Q5. What is the maximum number of electrons that can be accommodated in an f-subshell?
(a) 6
(b) 10
(c) 14
(d) 18
Show Answer
Answer: (c)
Explanation: The f-subshell has 7 orbitals, and each orbital can hold 2 electrons → 7 × 2 = 14 electrons.
Q6. The number of radial nodes in a 4p orbital is:
(a) 0
(b) 1
(c) 2
(d) 3
Show Answer
Answer: (c)
Explanation: Radial nodes = n – l – 1 = 4 – 1 – 1 = 2.
Q7. What is the de Broglie wavelength of an electron moving with a velocity of 3 × 106 m/s? (mass of electron = 9.11 × 10-31 kg, h = 6.63 × 10-34 J·s)
(a) 2.42 × 10-10 m
(b) 7.28 × 10-11 m
(c) 1.21 × 10-10 m
(d) 4.85 × 10-11 m
Show Answer
Answer: (c)
Explanation: λ = h / mv = 6.63×10-34 / (9.11×10-31 × 3×106) = 1.21×10-10 m.
Q8. Which of the following violates the Pauli Exclusion Principle?
(a) Two electrons in the same orbital with opposite spins
(b) Two electrons in different orbitals with same spin
(c) Two electrons in same orbital with same spin
(d) Electrons with half-integer spins
Show Answer
Answer: (c)
Explanation: Pauli Exclusion Principle states no two electrons in the same atom can have identical quantum numbers.
Q9. Which of the following is a valid set of quantum numbers for an electron in 3d orbital?
(a) n=3, l=1, m=1, s=+1/2
(b) n=3, l=2, m=0, s=+1/2
(c) n=3, l=0, m=0, s=-1/2
(d) n=3, l=3, m=2, s=+1/2
Show Answer
Answer: (b)
Explanation: For 3d, n=3, l=2, m can be -2 to +2; s=±1/2.
Q10. If the energy of an electron in a hydrogen atom is -3.4 eV, what is its principal quantum number?
(a) 1
(b) 2
(c) 3
(d) 4
Show Answer
Answer: (b)
Explanation: Energy = -13.6/n2; solving -13.6/n2 = -3.4 gives n = 2.
Q11. The shape of the s orbital is:
(a) Spherical
(b) Dumbbell
(c) Double dumbbell
(d) Circular planar
Show Answer
Answer: (a)
Explanation: s orbitals are spherical in shape and are non-directional.
Q12. Which of the following transitions in hydrogen atom emits maximum energy?
(a) n=5 to n=4
(b) n=4 to n=3
(c) n=3 to n=2
(d) n=2 to n=1
Show Answer
Answer: (d)
Explanation: Energy difference is highest for n=2 to n=1 transition as energy levels are closer at higher n values.
Q13. Bohr’s model fails for:
(a) Hydrogen atom
(b) Hydrogen-like ions
(c) Multielectron atoms
(d) Ionized helium
Show Answer
Answer: (c)
Explanation: Bohr’s model accurately predicts only single-electron systems; it cannot account for electron-electron interactions in multi-electron atoms.
Q14. The number of electrons in N3− ion is:
(a) 7
(b) 8
(c) 10
(d) 11
Show Answer
Answer: (c)
Explanation: Nitrogen has 7 electrons; gaining 3 gives 10 electrons.
Q15. What is the angular momentum of an electron in the third orbit of hydrogen atom according to Bohr’s model?
(a) h
(b) h/2π
(c) 2h/π
(d) 3h/2π
Show Answer
Answer: (d)
Explanation: Angular momentum = n(h/2π); for n=3 → 3h/2π.
Q16. Which concept explains the arrangement of electrons in increasing energy order in orbitals?
(a) Hund’s Rule
(b) Aufbau Principle
(c) Pauli Exclusion Principle
(d) Bohr’s postulates
Show Answer
Answer: (b)
Explanation: Aufbau principle guides filling of electrons from lower to higher energy orbitals.
Q17. The maximum number of electrons in a shell is given by:
(a) 2n
(b) 2n2
(c) n2
(d) n
Show Answer
Answer: (b)
Explanation: Maximum electrons in a shell = 2n2, where n is the principal quantum number.
Q18. The azimuthal quantum number for d-orbital is:
(a) 0
(b) 1
(c) 2
(d) 3
Show Answer
Answer: (c)
Explanation: For s, l=0; p, l=1; d, l=2; f, l=3.
Q19. Who proposed the concept of dual nature of electron?
(a) Bohr
(b) de Broglie
(c) Heisenberg
(d) Rutherford
Show Answer
Answer: (b)
Explanation: Louis de Broglie proposed that particles like electrons exhibit both particle and wave nature.
Q20. The Heisenberg Uncertainty Principle is significant for:
(a) Macroscopic particles
(b) Electrons
(c) Planets
(d) Bullets
Show Answer
Answer: (b)
Explanation: The uncertainty principle is applicable to microscopic particles such as electrons, not macroscopic objects.
We hope the given mcq questions with Answers for Structure of Atom Class 11 helps you in your learning.
Also check
- Structure of Atom – Class 11 Chemistry Chapter 2 MCQ Questions with Answers (Updated)
- Some Basic Concepts of Chemistry – Class 11 Chemistry Chapter 1 MCQ Questions with Answers (Updated)
🚀 Boost Your Exam Prep: Get MCQ Questions for all subjects (Class 6-12) now!
👉 Explore more resources on CBSE Class 11
Topics from which mcq questions may be asked
- Bohr model
- Quantum numbers
- Electronic configuration
Atomic structure is the key to understanding the nature of matter.
Frequently Asked Questions (FAQs) on Structure of Atom MCQ Questions
Q1: What type of MCQs are included for Class 11 Chemistry?
A1: The MCQs cover conceptual, numerical, application-based, and competency-based questions from all chapters of the NCERT Class 11 Chemistry book, following the latest CBSE guidelines.
Q2: Are these MCQs suitable for NEET or competitive exams?
A2: Yes, many of the MCQs are designed with a higher level of difficulty, suitable for NEET, JEE, and other entrance exams, especially in the Organic and Physical Chemistry sections.
Q3: Do these Class 11 Chemistry MCQs follow the updated CBSE syllabus?
A3: Absolutely. All questions are aligned with the latest CBSE syllabus and NCERT textbook for Class 11 Chemistry.
Q4: Are answers and explanations provided with each MCQ?
A4: Yes. Each MCQ comes with the correct answer and, wherever needed, a short explanation to help students understand the concept better.
Q5: How should I use these MCQs for exam preparation?
A5: Practice chapterwise first, then take topic-based timed quizzes. Focus on tricky and frequently asked concepts. Revise wrong answers and refer to the explanation provided.
Q6: Can teachers and coaching institutes use this material?
A6: Definitely! These MCQs are ideal for classroom assignments, weekly tests, online quizzes, and evaluation by teachers, schools, and coaching centers.
Q7: Where can I find chapterwise Class 11 Chemistry MCQ questions with answers?
A7: You can find chapterwise MCQ questions with answers and detailed explanations on trusted educational platforms like xamcontent.com and physicsgurukul.com. These cover both basic and advanced-level questions.
