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Class 11 Chemistry — Chapter 2: Structure of Atom Online Test

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Class 11 Chemistry: Structure of Atom Online Test (Paper 1)

Welcome to Paper 1! This is your foundation to build confidence and get you ready to tackle the challenges ahead.

  • Total Questions: 20
  • Time Allotted: 30 minutes
  • Passing Score: 40%
  • Randomization: No
  • Certificate: No
  • Retake: Allowed
  • Price: 100% Free

Good luck! 👍

1 / 20

1. For hydrogen atom, the ratio of radii of 1st and 3rd orbit is:

2 / 20

2. The number of radial nodes in 5d orbital is:

3 / 20

3. The ionization energy of hydrogen atom in the ground state is:

4 / 20

4. The electronic configuration of neon (Z=10) is:

5 / 20

5. The electronic configuration of helium (Z=2) is:

6 / 20

6. Why do electrons prefer to occupy different orbitals of equal energy before pairing?

7 / 20

7. When two subshells have the same value, the one that fills first is the one with:

8 / 20

8. Which d-orbitals have lobes oriented between the axes (at 45° angles)?

9 / 20

9. The radial probability distribution curve of a 2s orbital shows:

10 / 20

10. The value of is associated with:

11 / 20

11. The azimuthal quantum number primarily determines the:

12 / 20

12. If , how many orbitals are possible in that shell?

13 / 20

13. The three dumbbell-shaped orbitals oriented along x, y, and z axes are:

14 / 20

14. What physical meaning does the wave function itself have?

15 / 20

15. The first line of the Brackett series corresponds to which transition?

16 / 20

16. Which equation represents Einstein’s photoelectric effect?

17 / 20

17. What is the wavelength of a radio wave with frequency ?

18 / 20

18. Which of the following is a correct postulate of Bohr’s atomic model?

19 / 20

19. In Chadwick’s experiment, which element was bombarded with alpha particles to discover the neutron?

20 / 20

20. What conclusion did Rutherford draw from the gold foil experiment?

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Class 11 Chemistry: Structure of Atom Online Test (Paper 2)

Welcome to Paper 2! You’ve mastered the basics, and now it’s time to test your understanding with a more challenging set of questions.

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  • Total Questions: 30
  • Time Allotted: 45 minutes
  • Passing Score: 50%
  • Randomization: Yes
  • Certificate: No
  • Retake: Allowed
  • Price: 100% Free

Good luck! 👍

1 / 30

1. Which element has a fully filled d-subshell in its ground state configuration?

2 / 30

2. Why are half-filled and fully filled subshells more stable?

3 / 30

3. Which element has the configuration [Ar] 4s²?

4 / 30

4. Which orbital is oriented along the z-axis with a unique donut-shaped ring?

5 / 30

5. The maximum number of electrons that can be accommodated in an orbital is:

6 / 30

6. What is the charge of a proton in coulombs?

7 / 30

7. Pauli’s exclusion principle explains which property of matter?

8 / 30

8. Which shell corresponds to ?

9 / 30

9. What does the quantum number in Bohr’s model represent?

10 / 30

10. Which orbital will have the maximum number of angular nodes?

11 / 30

11. What is the ionization energy of hydrogen atom in ground state?

12 / 30

12. Which of the following transition metals also shows an anomalous configuration similar to copper?

13 / 30

13. The three p-orbitals are oriented:

14 / 30

14. In Bohr’s model, the energy difference between two orbits is given by:

15 / 30

15. According to Planck’s quantum theory, energy is emitted or absorbed in:

16 / 30

16. The wavelength of the first Lyman series line in hydrogen is approximately:

17 / 30

17. The ionization energy of hydrogen atom in the ground state is:

18 / 30

18. Which element has the stable configuration [Ar] 3d¹⁰ 4s² 4p⁶ 5s²?

19 / 30

19. Which comparison is correct regarding Thomson vs. Rutherford models?

20 / 30

20. Which hydrogen spectral line lies in the red region of the visible spectrum?

21 / 30

21. According to the uncertainty principle, increasing the accuracy of measuring a particle’s position will:

22 / 30

22. Which subshell can accommodate a maximum of 14 electrons?

23 / 30

23. For hydrogen atom, the ratio of radii of 1st and 3rd orbit is:

24 / 30

24. Which unit combination correctly represents frequency?

25 / 30

25. Which color of visible light diffracts the most?

26 / 30

26. Which experiment first gave evidence of electron spin?

27 / 30

27. Which principle explains the interference of light waves?

28 / 30

28. How many unpaired electrons are there in oxygen (Z=8) based on Hund’s rule?

29 / 30

29. The probability distribution of a p-orbital is:

30 / 30

30. Which of the following d-orbitals has a different shape compared to the others?

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Class 11 Chemistry: Structure of Atom Online Test (Paper 3)

Welcome to Paper 3! You’ve warmed up—now it's time to step up your game and conquer the challenge with tougher questions!

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  • Total Questions: 50
  • Time Allotted: 75 minutes
  • Passing Score: 70%
  • Randomization: Yes
  • Certificate: Yes
  • Retake: Allowed
  • Price: 100% Free

Good luck! 👍

1 / 30

1. Which arrangement produces an absorption spectrum?

2 / 30

2. Which of the following quantum numbers decides the shape of an orbital?

3 / 30

3. If the wave number of light is , its wavelength is:

4 / 30

4. Pauli’s exclusion principle states that:

5 / 30

5. Which transition produces the first line of the Balmer series?

6 / 30

6. Which of the following sets correctly matches the charge of subatomic particles?

7 / 30

7. Which subatomic particle is responsible for chemical bonding and reactivity?

8 / 30

8. If uncertainty in position of an electron is reduced, what happens to the uncertainty in its momentum?

9 / 30

9. Which of the following is NOT true about atomic orbitals?

10 / 30

10. Which unit combination correctly represents frequency?

11 / 30

11. The ground-state configuration of chlorine (Z=17) is:

12 / 30

12. What is the mass of a proton?

13 / 30

13. The configuration [Kr] 5s² 4d¹⁰ 5p⁵ corresponds to:

14 / 30

14. Which of the following is NOT a postulate of Bohr’s model?

15 / 30

15. The principal quantum number () primarily describes:

16 / 30

16. Which subshell can accommodate a maximum of 14 electrons?

17 / 30

17. The Rydberg formula for hydrogen spectral lines is:

18 / 30

18. Which principle is closely related to the wave nature of matter proposed by de Broglie?

19 / 30

19. For an atom with embedded electrons in Thomson’s model, which expresses charge neutrality?

20 / 30

20. The values of indicate:

21 / 30

21. What is an emission spectrum?

22 / 30

22. How many orbitals are present in the d-subshell?

23 / 30

23. Which orbital has a spherical shape around the nucleus?

24 / 30

24. Which type of spectrum shows bright lines against a dark background?

25 / 30

25. Why does hydrogen emit line spectra instead of a continuous spectrum?

26 / 30

26. In Bohr’s model, the lowest energy state of hydrogen corresponds to:

27 / 30

27. Which subatomic particle contributes to both the mass and stability of the nucleus but not to the atomic number?

28 / 30

28. According to Bohr’s quantization rule, the angular momentum of an electron is:

29 / 30

29. Which scientist measured the charge of an electron after Thomson’s work?

30 / 30

30. When two subshells have the same value, the one that fills first is the one with:

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Practice Structure of Atom MCQs
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Class 11 Chemistry: Chapter 2 — Structure of Atom Online Test

The Class 11 Chemistry: Chapter 2 — Structure of Atom Online Test is designed to give you a thorough understanding of atomic structure. With a pool of 475 MCQs, this test covers the fundamental concepts of atomic theory, electron configuration, and subatomic particles. This test is completely free, CBSE/NCERT-aligned, and provides instant results after each attempt. It is divided into three difficulty levels to help you build confidence and gradually progress to more challenging questions.

What is this Chapter 2 Online Test?

This test contains three exam-style MCQ papers for Chapter 2: Structure of Atom:

  • Paper 1 (Easy) — Foundation: 20 questions · 30 min · Pass 40% · Fixed set
  • Paper 2 (Medium) — Mixed: 30 questions · 45 min · Pass 50% · Randomized from a pool of ~475 questions
  • Paper 3 (Hard) — Challenge: 50 questions · 75 min · Pass 70% · Randomized from the same pool + Certificate on pass

Note: You get new question mixes in Paper 2 and Paper 3 on every attempt. Each attempt is timed, auto-evaluated, and shows your score with an answer review.

Topics Covered in These Online Tests

In this online test, you will practice key topics from Chapter 2: Structure of Atom, which include:

  • Discovery of Subatomic Particles — Electrons, Protons, Neutrons, and their properties
  • Thomson’s Model of Atom — Plum pudding model and its limitations
  • Rutherford’s Model of Atom — Gold foil experiment and its conclusions
  • Bohr’s Model of Atom — Energy levels, quantization of energy, and hydrogen spectrum
  • Dual Nature of Matter — Wave-particle duality of electrons, de Broglie hypothesis
  • Quantum Mechanical Model — Schrödinger’s equation, orbitals and quantum numbers
  • Electron Configuration — Aufbau principle, Pauli exclusion principle, Hund’s rule
  • Atomic Orbitals and Quantum Numbers — Types of orbitals (s, p, d, f) and their significance

How This Exam-Style Online Test Works

  • Pick a paper → Answer MCQs within time → Submit → Get instant score and answer review.
  • Timed MCQs: Paper 1: 30 minutes, Paper 2: 45 minutes, Paper 3: 75 minutes.
  • Instant feedback: Your score and detailed summary with answers are available immediately.
  • Unlimited retakes: You can retake the test as many times as you like. Paper 2 and Paper 3 offer fresh mixes on each attempt.
  • Certificate: A certificate is awarded after successfully passing Paper 3 with a score of 70% or more.

Who Can Take This Test?

  • Class 11 CBSE/NCERT students preparing for unit tests, mid-term exams, and final exams.
  • JEE Main/Advanced & NEET aspirants seeking a strong foundation in Chemistry concepts.
  • School students wanting to improve their understanding of atomic structure and related topics.
  • Teachers and tutors who need practice tests for their students.
  • Self-learners and home-schoolers wanting an online resource for Chapter 2 practice.

Advantages of this Online Test

  • Real exam feel: Timed tests help you simulate the real exam environment, improving time management.
  • Step-up difficulty: Progress from Paper 1 (easy) to Paper 3 (hard) to master the topic.
  • Instant feedback: You’ll get a score, review your answers, and learn where you need improvement.
  • Unlimited attempts: Take the test as many times as you want, improving with each attempt.
  • Completely free: No charges, no sign-in required—just unlimited access to the online test.

How This Test Helps You Study Better

  • Step 1 – Concept check: Take Paper 1 after reading the chapter to gauge your understanding.
  • Step 2 – Reinforce learning: Take Paper 2 for a balanced mix of theory and numerical questions.
  • Step 3 – Challenge yourself: Take Paper 3 to assess your mastery of the chapter.
  • Step 4 – Review: Analyze your results and reattempt the test to improve your knowledge.

Important Notes (Read Before You Start)

  • Do not refresh or close the tab during the test as it will interrupt your session.
  • Best experience: Use a modern browser and stable internet connection for optimal performance.
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