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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

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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 the configuration 1s² 2s² 2p⁶ 3s² 3p⁶ 4s²?

2 / 30

2. Which factor does not affect the kinetic energy of emitted photoelectrons?

3 / 30

3. The configuration [Ne] 3s² 3p⁵ corresponds to which element?

4 / 30

4. Which rule is based directly on quantum numbers to fill atomic orbitals?

5 / 30

5. In Schrödinger’s model, the mathematical function describes:

6 / 30

6. The energy of emitted photon in hydrogen spectrum is related to:

7 / 30

7. Which principle is naturally incorporated into Schrödinger’s wave mechanics?

8 / 30

8. If frequency of incident light equals threshold frequency, then:

9 / 30

9. Which quantum number determines the shape of an orbital?

10 / 30

10. Why do elements like Cr, Mo, Cu, Ag show anomalous configurations?

11 / 30

11. What is an emission spectrum?

12 / 30

12. The splitting of spectral lines in a magnetic field is explained by:

13 / 30

13. Which key limitation made the plum pudding model incompatible with atomic emission spectra?

14 / 30

14. Which electromagnetic theory of light was given by Maxwell?

15 / 30

15. The shape of f-orbitals is generally described as:

16 / 30

16. The Rydberg formula for hydrogen spectral lines is:

17 / 30

17. Which radiation is often called “black light” and used in forensic investigations?

18 / 30

18. The expected configuration of copper (Z=29) based on Aufbau principle is:

19 / 30

19. Which of the following best explains the difference between orbit and orbital?

20 / 30

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

21 / 30

21. The energy of an orbital depends mainly on:

22 / 30

22. Which limitation of Bohr’s model is correct?

23 / 30

23. How many orientations are possible for p-orbitals?

24 / 30

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

25 / 30

25. Which orbital is spherical in shape?

26 / 30

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

27 / 30

27. According to Bohr’s model, electrons revolve around the nucleus in:

28 / 30

28. Which quantum number primarily determines the size of an orbital?

29 / 30

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

30 / 30

30. What kind of spectrum is produced when white light passes through a cold gas before entering a spectroscope?

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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 / 50

1. The energy of an electron in the hydrogen atom is proportional to:

2 / 50

2. What is the relative mass of a proton compared to an electron?

3 / 50

3. Which graph best represents Einstein’s photoelectric equation?

4 / 50

4. Which of the following best explains the difference between orbit and orbital?

5 / 50

5. The expected configuration of copper (Z=29) based on Aufbau principle is:

6 / 50

6. Which postulate of Bohr explains the discrete line spectrum of hydrogen?

7 / 50

7. Which quantum number decides the number of orbitals in a subshell?

8 / 50

8. What is meant by the term “spectrum” in physics?

9 / 50

9. The dark Fraunhofer lines observed in sunlight are an example of:

10 / 50

10. Which subshell can have a maximum of 14 electrons?

11 / 50

11. The spin quantum number () describes:

12 / 50

12. In classical mechanics, both position and momentum can be measured exactly. Why not in quantum mechanics?

13 / 50

13. Hund’s rule of maximum multiplicity states that:

14 / 50

14. Who discovered the neutron?

15 / 50

15. Which of the following is dimensionally equivalent to wave number?

16 / 50

16. The Paschen series of hydrogen lies in which region of the electromagnetic spectrum?

17 / 50

17. Which principle explains the interference of light waves?

18 / 50

18. What is the total number of orbitals in the second shell ()?

19 / 50

19. Which gas produced the smallest positive canal ray particle (proton) during Goldstein’s experiments?

20 / 50

20. According to de Broglie, the wavelength of a particle is given by:

21 / 50

21. Which of the following could not be justified by Bohr’s model?

22 / 50

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

23 / 50

23. For hydrogen atom, the energy of electron in 3rd orbit is:

24 / 50

24. The orientation of orbital is:

25 / 50

25. What would happen if Pauli’s exclusion principle did not exist?

26 / 50

26. Which of the following is correct about the principal quantum number?

27 / 50

27. Which property of neutrons makes them highly useful in nuclear reactions?

28 / 50

28. Which is the correct configuration for iron (Z=26)?

29 / 50

29. The stopping potential in a photoelectric experiment is directly related to:

30 / 50

30. The frequency of visible light of wavelength 600 nm is approximately:

31 / 50

31. Which of the following quantum numbers is not possible for any electron?

32 / 50

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

33 / 50

33. The first line of Paschen series corresponds to which transition?

34 / 50

34. What deflection pattern for α-particles would the plum pudding model predict?

35 / 50

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

36 / 50

36. The wavelength of the second line of Balmer series in hydrogen is approximately:

37 / 50

37. Which orbital is spherical in shape?

38 / 50

38. What is the charge on a neutron?

39 / 50

39. How many orientations are possible for f-orbitals?

40 / 50

40. In an octahedral field, orbitals pointing directly along the axes experience:

41 / 50

41. Which scientist gave the photon explanation of the photoelectric effect?

42 / 50

42. What is the condition for allowed orbits in Bohr’s theory?

43 / 50

43. The Balmer- line (H) in the hydrogen spectrum is produced by the transition:

44 / 50

44. Why is Bohr’s model called semi-classical?

45 / 50

45. The spin quantum number () signifies:

46 / 50

46. At what minimum value of do p-orbitals first appear?

47 / 50

47. Increasing light intensity above threshold frequency will:

48 / 50

48. Which orbital has no directional orientation in space?

49 / 50

49. Which statement best describes Thomson’s “plum pudding” model of the atom?

50 / 50

50. Which has the highest frequency among electromagnetic waves?

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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.
  • Allow cookies / local storage to save your progress.
  • 100% free: There are no hidden charges for taking this test.

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