Exam-Style Online Test | Chemistry: Structure Of Atom Test

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 of the following spectroscopic phenomena is explained using electron spin?

2 / 30

2. Which of the following notations is INCORRECT?

3 / 30

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

4 / 30

4. Which subatomic particle is positively charged?

5 / 30

5. Which principle explains the interference of light waves?

6 / 30

6. Which element’s ground-state configuration demonstrates Hund’s rule?

7 / 30

7. Which of the following correctly expresses wave number?

8 / 30

8. The magnetic quantum number () signifies:

9 / 30

9. The orientation of p-orbitals in space is given by:

10 / 30

10. In Bohr’s theory, electrons revolve in orbits because:

11 / 30

11. According to the rule, which orbital fills before ?

12 / 30

12. The time-independent Schrödinger equation is written as:

13 / 30

13. In Rutherford’s gold foil experiment, what was the source of alpha particles?

14 / 30

14. X-rays are mainly used in:

15 / 30

15. Which is the correct configuration of palladium (Z=46), an anomaly in the d-block?

16 / 30

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

17 / 30

17. The energy required to excite an electron in hydrogen atom from to is:

18 / 30

18. Which orbital fills immediately after 4p according to Aufbau sequence?

19 / 30

19. The quantity in Schrödinger’s equation represents:

20 / 30

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

21 / 30

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

22 / 30

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

23 / 30

23. What is the frequency of radiation emitted when an electron jumps from to in hydrogen?

24 / 30

24. The frequency of radiation emitted when an electron falls from to is given by:

25 / 30

25. Which assumption of Bohr’s model contradicts the uncertainty principle?

26 / 30

26. How does increasing gas pressure typically affect spectral lines (emission or absorption)?

27 / 30

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

28 / 30

28. Planck introduced his quantum hypothesis to explain:

29 / 30

29. Before the discovery of neutrons, which problem remained unresolved in atomic models?

30 / 30

30. Which experiment first gave evidence of electron spin?

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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
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  • Price: 100% Free

Good luck! 👍

1 / 50

1. In Bohr’s atomic model, an orbit refers to:

2 / 50

2. How many quantum numbers are required to specify an electron completely in an atom?

3 / 50

3. Bohr’s model could not explain the fine structure of hydrogen spectrum because:

4 / 50

4. The term “maximum multiplicity” in Hund’s rule refers to:

5 / 50

5. What is the charge-to-mass ratio (e/m) of an electron determined by J.J. Thomson?

6 / 50

6. Which of the following is NOT correct about p-orbitals?

7 / 50

7. The number of angular nodes in 4d orbital is:

8 / 50

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

9 / 50

9. How many orbitals are present in a subshell with ?

10 / 50

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

11 / 50

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

12 / 50

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

13 / 50

13. Which of the following best describes hydrogen line spectra?

14 / 50

14. The principal quantum number () signifies:

15 / 50

15. The three p-orbitals are oriented:

16 / 50

16. The spin quantum number () describes:

17 / 50

17. Which property of light is explained by the phenomenon of interference?

18 / 50

18. After is filled, which orbital is filled next in most atoms?

19 / 50

19. The maximum number of electrons that can occupy all five d-orbitals is:

20 / 50

20. Which of the following sets of quantum numbers is NOT allowed?

21 / 50

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

22 / 50

22. The stability of half-filled p-subshell is evident in:

23 / 50

23. What conclusion did Thomson draw from cathode ray experiments?

24 / 50

24. Why is copper (Z=29) an exception to the normal Aufbau filling?

25 / 50

25. The uncertainty in the position of an electron is . What is the minimum uncertainty in its momentum (h = )?

26 / 50

26. The energy required to remove an electron from level of hydrogen atom is:

27 / 50

27. Which experiment led to the discovery of electrons?

28 / 50

28. Which subatomic particle has the smallest mass?

29 / 50

29. What prevents electrons from spiraling into the nucleus in Bohr’s model?

30 / 50

30. Who discovered canal rays (positive rays) leading to the discovery of the proton?

31 / 50

31. Which transition produces the shortest wavelength line in a hydrogen series?

32 / 50

32. Which orbital fills immediately after 4p according to Aufbau sequence?

33 / 50

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

34 / 50

34. Which electromagnetic radiation has wavelengths slightly longer than visible red light?

35 / 50

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

36 / 50

36. Which of the following is a correct implication of the uncertainty principle?

37 / 50

37. The orientation of p-orbitals in space is given by:

38 / 50

38. Which orbital is non-spherical in shape and has 3 orientations?

39 / 50

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

40 / 50

40. What is the velocity of a wave with frequency and wavelength ?

41 / 50

41. Which statement about Schrödinger’s wave equation is correct?

42 / 50

42. The Rydberg formula for hydrogen spectral lines is:

43 / 50

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

44 / 50

44. Which limitation of Bohr’s model was later resolved by quantum mechanics?

45 / 50

45. Who formulated the wave equation that describes the behavior of an electron in an atom?

46 / 50

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

47 / 50

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

48 / 50

48. Pauli’s exclusion principle states that:

49 / 50

49. Which relation is correct for photon momentum?

50 / 50

50. The velocity of an electron in the first Bohr orbit of hydrogen is approximately:

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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)

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