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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. What is the total number of nodes in 4p orbital?

2 / 30

2. The number of angular nodes in any d-orbital is:

3 / 30

3. The Pfund series of hydrogen corresponds to electron transitions to:

4 / 30

4. Which relation is correct between frequency and time period ?

5 / 30

5. What is the maximum number of electrons that can occupy a single orbital?

6 / 30

6. Aufbau principle states that:

7 / 30

7. In a line spectrum, each line corresponds to:

8 / 30

8. What did the plum pudding model successfully account for?

9 / 30

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

10 / 30

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

11 / 30

11. According to Bohr, when is radiation emitted or absorbed by an atom?

12 / 30

12. Which sequence correctly lists the filling order up to ?

13 / 30

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

14 / 30

14. Why was the discovery of the neutron important?

15 / 30

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

16 / 30

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

17 / 30

17. What was the key observation from Rutherford’s gold foil experiment?

18 / 30

18. Which set of axes represents the orientations of the three p-orbitals?

19 / 30

19. The number of atomic orbitals in the shell is given by:

20 / 30

20. The five d-orbitals have orientations described by:

21 / 30

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

22 / 30

22. Which type of equation is Schrödinger’s wave equation?

23 / 30

23. If an electron is in shell, it is in which orbital?

24 / 30

24. The de Broglie wavelength of an electron accelerated through potential is:

25 / 30

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

26 / 30

26. The Brackett series of hydrogen lines appears in which region?

27 / 30

27. Which formula represents the condition for allowed electron orbits according to de Broglie?

28 / 30

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

29 / 30

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

30 / 30

30. Which statement about emission vs absorption for the same transition is correct?

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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 shape of an orbital is determined by which quantum number?

2 / 50

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

3 / 50

3. Quantum numbers are used to:

4 / 50

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

5 / 50

5. The ionization energy of He⁺ ion is:

6 / 50

6. Which type of electromagnetic wave is mainly responsible for sunburn?

7 / 50

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

8 / 50

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

9 / 50

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

10 / 50

10. The mathematical expression of the uncertainty principle is:

11 / 50

11. The electronic configuration of silver (Z=47) is anomalous and written as:

12 / 50

12. Which region of the EM spectrum has the highest frequency?

13 / 50

13. Which of the following is a major limitation of Bohr’s model?

14 / 50

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

15 / 50

15. Which transition in the hydrogen atom gives the Lyman series?

16 / 50

16. Which of the following increases as the principal quantum number increases?

17 / 50

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

18 / 50

18. The magnetic quantum number () signifies:

19 / 50

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

20 / 50

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

21 / 50

21. For the shell , the possible values of are:

22 / 50

22. Which of the following is NOT a correct statement about orbitals?

23 / 50

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

24 / 50

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

25 / 50

25. The energy of a photon of frequency is given by:

26 / 50

26. Which combination of quantum numbers is not possible?

27 / 50

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

28 / 50

28. What ultimately fixes the position of a spectral line in either emission or absorption?

29 / 50

29. The maximum number of electrons that can be present in all orbitals with is:

30 / 50

30. The number of orbitals present in the 3rd shell () is:

31 / 50

31. How many orbitals are present in the p-subshell?

32 / 50

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

33 / 50

33. How many p-orbitals exist in each shell where ?

34 / 50

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

35 / 50

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

36 / 50

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

37 / 50

37. Which hydrogen spectral series lies entirely in the visible region?

38 / 50

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

39 / 50

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

40 / 50

40. The energy of an orbital depends mainly on:

41 / 50

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

42 / 50

42. What is an atomic orbital?

43 / 50

43. Which subatomic particle defines isotopes of an element?

44 / 50

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

45 / 50

45. If wavelength of radiation is , the photon energy is:

46 / 50

46. Which subshell fills earlier on the basis of the rule (use tie-breaker if needed): or ?

47 / 50

47. According to Bohr, when is radiation emitted or absorbed by an atom?

48 / 50

48. The speed of electromagnetic waves in a medium is less than in vacuum because:

49 / 50

49. Which experimental fact could not be explained by Bohr’s model?

50 / 50

50. The de Broglie wavelength of an electron accelerated through potential is:

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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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