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Class 11 Chemistry — Chapter 3: Classification of Elements and Periodicity in Properties Online Test

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Class 11 Chemistry: Classification of Elements and Periodicity in Properties 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. Which property is not periodic in nature?

2 / 20

2. What is meant by the diagonal relationship in the periodic table?

3 / 20

3. What is meant by valency of an element?

4 / 20

4. Which of the following best explains why halogens have highly negative first electron gain enthalpies?

5 / 20

5. Why is Al³⁺ smaller than Na⁺ though both are cations?

6 / 20

6. Which factor most strongly influences covalent radius across a period?

7 / 20

7. Identify the block for the configuration .

8 / 20

8. What is the root word for digit 2 in the IUPAC naming system?

9 / 20

9. Which group contains the alkaline earth metals?

10 / 20

10. Which group of elements was not included in Mendeleev’s original periodic table?

11 / 20

11. Which major drawback arose when elements were grouped only as metals and non-metals?

12 / 20

12. Which block contains the inner transition elements?

13 / 20

13. How did Moseley experimentally determine atomic number?

14 / 20

14. During which period of history did the number of known elements grow rapidly due to improved experimental techniques?

15 / 20

15. Why was the position of hydrogen a limitation in Mendeleev’s table?

16 / 20

16. Which of the following elements shows the smallest covalent radius?

17 / 20

17. Which of the following factors does NOT affect electron gain enthalpy?

18 / 20

18. Which element shows +2 and +3 oxidation states, with +3 being more stable?

19 / 20

19. For p-block elements, how is group number related to valency?

20 / 20

20. What is the general trend of electron gain enthalpy down a group?

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Class 11 Chemistry: Classification of Elements and Periodicity in Properties 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. Why do noble gases have positive electron gain enthalpies?

2 / 30

2. Which element’s properties did Mendeleev successfully predict before its discovery?

3 / 30

3. Which factor does NOT directly affect electron gain enthalpy?

4 / 30

4. Why is the second ionization enthalpy of sodium extremely high compared to the first?

5 / 30

5. The configuration belongs to which block?

6 / 30

6. What is the periodic trend of metallic character across a period?

7 / 30

7. Why is the radius of an anion always larger than its parent atom?

8 / 30

8. Which element has the largest atomic radius in Group 1 (alkali metals)?

9 / 30

9. Which limitation of Newlands’ Octaves showed its inadequacy?

10 / 30

10. Which element has the maximum electronegativity in the periodic table?

11 / 30

11. Which statement about helium’s “block” and “group placement” is correct?

12 / 30

12. What is the second electron gain enthalpy of oxygen?

13 / 30

13. Which element has higher electronegativity, sulfur or chlorine?

14 / 30

14. What is the general trend of electron gain enthalpy down a group?

15 / 30

15. The electronic configuration of an element is [Ne] 3s²3p⁵. To which group does it belong?

16 / 30

16. Compare the size of Cl (neutral atom) and Cl⁻ (anion).

17 / 30

17. Compare the radii of isoelectronic species N³⁻, O²⁻, F⁻. Which is largest?

18 / 30

18. Which of the following explains why cations are smaller than anions?

19 / 30

19. What did Mendeleev’s Periodic Law state?

20 / 30

20. Which element has the lowest electronegativity?

21 / 30

21. Arrange the species O²⁻, F⁻, Na⁺, Mg²⁺ in order of increasing radius.

22 / 30

22. Why does boron show chemistry very different from aluminum?

23 / 30

23. Which factor most strongly influences covalent radius across a period?

24 / 30

24. What is the first electron gain enthalpy of oxygen?

25 / 30

25. What is meant by valency of an element?

26 / 30

26. What was the significance of Newlands’ Law of Octaves despite its limitations?

27 / 30

27. Which of the following best describes metalloids?

28 / 30

28. What does the Modern Periodic Law state?

29 / 30

29. Why was Mendeleev’s law eventually modified?

30 / 30

30. Which group is also known as the chalcogens or oxygen family?

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Class 11 Chemistry: Classification of Elements and Periodicity in Properties 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. Which element was named after the scientist Nicolaus Copernicus?

2 / 50

2. Which heavy p-block element exhibits variable valencies of +3 and +5?

3 / 50

3. How many periods are present in the long form of the modern periodic table?

4 / 50

4. Which element is an exception, often showing both metallic and non-metallic behavior?

5 / 50

5. Which property is common among all metals?

6 / 50

6. Who is credited with the first attempt to classify elements systematically?

7 / 50

7. Which group is known as the halogens?

8 / 50

8. Which of the following explains why cations are smaller than anions?

9 / 50

9. What is meant by the diagonal relationship in the periodic table?

10 / 50

10. What are the two common oxidation states of copper?

11 / 50

11. Why does atomic radius decrease across a period?

12 / 50

12. Which of the following is an example of misplacement in random classification?

13 / 50

13. Which digit is represented by the root “pent”?

14 / 50

14. What was the main idea behind Döbereiner’s Triads?

15 / 50

15. Why does beryllium behave differently from other alkaline earth metals?

16 / 50

16. Which factor most strongly influences covalent radius across a period?

17 / 50

17. Which has a smaller radius: Mg²⁺ or Na⁺?

18 / 50

18. Why is Al³⁺ smaller than Na⁺ though both are cations?

19 / 50

19. What is the general trend of ionization enthalpy down a group?

20 / 50

20. Which gas is essential for combustion and respiration?

21 / 50

21. What did Mendeleev’s Periodic Law state?

22 / 50

22. Which groups are known as the representative or main group elements?

23 / 50

23. Which important scientific principle was missing from random classification?

24 / 50

24. The electronic configuration of an element is [Ne] 3s²3p⁵. To which group does it belong?

25 / 50

25. Arrange the following in decreasing order of electron gain enthalpy: Cl, F, Br, I.

26 / 50

26. Which group of elements was historically called "halogens" due to similar salt-forming properties?

27 / 50

27. Why did Döbereiner’s Triads lose importance by the mid-19th century?

28 / 50

28. Why are lanthanides and actinides placed separately at the bottom of the periodic table?

29 / 50

29. Which of the following is an achievement of Mendeleev’s table?

30 / 50

30. Which element shows +2 and +3 oxidation states, with +3 being more stable?

31 / 50

31. Why does lithium resemble magnesium more than sodium?

32 / 50

32. Why was Mendeleev’s law eventually modified?

33 / 50

33. Which of the following is NOT a d-block element?

34 / 50

34. How many elements are present in the second period of the periodic table?

35 / 50

35. How did Mendeleev classify hydrogen?

36 / 50

36. What is the van der Waals radius?

37 / 50

37. In p-block elements, how is the group number related to valence electrons?

38 / 50

38. Which block elements are called transition elements?

39 / 50

39. Which statement correctly distinguishes “d-block” from “transition element” in IUPAC terms?

40 / 50

40. Which one among the following has the largest radius?

41 / 50

41. Why is the second ionization enthalpy always greater than the first?

42 / 50

42. Which of the following is NOT an example of variable valency?

43 / 50

43. The general valence shell configuration of Group 2 elements is:

44 / 50

44. Which property was mostly used by early chemists to group elements?

45 / 50

45. What is the valency of Group 1 elements?

46 / 50

46. Why was Newlands’ Law of Octaves criticized?

47 / 50

47. Which of the following pairs are isoelectronic species?

48 / 50

48. What is the general trend of electron gain enthalpy across a period?

49 / 50

49. For p-block elements, how is group number related to valency?

50 / 50

50. Why was random classification of elements considered unsatisfactory?

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Practice Classification of Elements and Periodicity in Properties MCQs
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Class 11 Chemistry — Chapter 3: Classification of Elements and Periodicity in Properties Online Test

The Class 11 Chemistry: Chapter 3 – Classification of Elements and Periodicity in Properties Online Test gives you a real exam feel with chapter-focused MCQs. You will answer timed questions, see your result instantly, review answers, and—if you pass Paper 3—download a certificate. This test is free, CBSE/NCERT-aligned, and allows unlimited attempts. It works like a quick chapter-wise mock test / quiz for fast revision of the periodic table and periodic trends.

Confused about modern periodic table, periodic trends or periodic properties? Don’t worry. This page is your safe practice space for Chapter 3. Think of it as a small online mock test you can take at home on your phone or laptop. Each attempt is a short online exam with objective questions. You simply start a paper, answer MCQs, see your score, and read the explanations. With every attempt you’ll understand the periodic table better. When you’re ready, go for Paper 3 and earn a certificate. One small step today, stronger Chemistry tomorrow.

What is this Class 11 Chemistry: Classification of Elements and Periodicity in Properties Online Test?

This page contains three exam-style MCQ papers for Chapter 3:

  • 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 375 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 answer review.

Topics covered in these online tests

These online tests are based on NCERT Class 11 Chemistry Chapter 3 and cover the full range of sub-topics. You will practice questions from:

  • Genesis of periodic classification — Dobereiner’s triads, Newlands’ law of octaves, Mendeleev’s periodic table
  • Modern periodic law and the long form of periodic table
  • Electronic configuration and periodic table — periods, groups, blocks (s, p, d, f)
  • Nomenclature of elements (including elements with Z > 100, IUPAC rules – basic idea)
  • Periodic trends in atomic properties — atomic radius, ionic radius, covalent radius, van der Waals radius
  • Ionization enthalpy — trends in periods and groups, factors affecting IE
  • Electron gain enthalpy — general trends, irregularities, halogens vs noble gases
  • Electronegativity — concept and trends (Pauling scale, basic comparisons)
  • Valence and valency — relation with electronic configuration
  • Anomalous behaviour of second period elements and diagonal relationship
  • Periodic trends in chemical reactivity of s- and p-block elements

For more detailed step-by-step practice, you can also try: Classification of Elements and Periodicity in Properties MCQs and the full Class 11 Chemistry MCQ Question Bank.

How This Exam-Style Online Test Works

Short version: Pick a paper → answer MCQs within time → submit → get instant score and review. Pass Paper 3 to get a certificate.

What you’ll see during the test

  • MCQs: One question with four options (A, B, C, D).
  • Timer on top: P1: 30 min • P2: 45 min • P3: 75 min.
  • Pagination: Typically 10 questions per page (move to next group using page controls).
  • Navigation: Use Next/Prev buttons or question map to revisit before submitting.
  • View Result: Click View Result to see marks and detailed summary.
  • Result page shows: score %, correct / incorrect / unanswered count, answer-key/review, and share options.
  • Restart: Click Restart Test to try again with a new mix of questions (P2 & P3).

Note: Please share your feedback on the result page after completing a test.

Marking & pass criteria

  • Scoring: +1 for correct, 0 for incorrect (no negative marking).
  • Passing marks: Paper 1 — 40% • Paper 2 — 50% • Paper 3 — 70%.
  • Randomization: Paper 2 & 3 shuffle questions from a large Chapter 3 question pool on every attempt; Paper 1 stays fixed.

Who can take this test?

  • CBSE Class 11 students revising Chapter 3 (Classification of Elements and Periodicity in Properties).
  • Class 12 bridge / revision learners who want to fix periodic table basics.
  • JEE/NEET foundation aspirants building strong command over periodic trends and periodic properties.
  • Teachers / tutors needing ready-made chapter tests for assignments and quizzes.
  • Students from other boards & countries who want extra practice on periodic trends.
  • Competitive exam aspirants revising core periodic table concepts through MCQs.

Advantages of this online test

  • Real exam feel: timer, pass %, and auto-submit on time out.
  • Instant feedback: get your score, see correct answers, and spot weak areas immediately.
  • Step-up difficulty: Easy → Mixed → Challenge (+ certificate on Paper 3).
  • Unlimited attempts: practice till perfect; fresh randomized sets in Paper 2 & 3.
  • Zero cost & safe: completely free; no payment, no signup required.

How this test helps you study better

Use this simple plan for Chapter 3:

  • Step 1 – Concept check: Attempt Paper 1 after studying the chapter. Note weak sub-topics (e.g. IE trends, EGE, diagonal relationship).
  • Step 2 – Reinforce: Attempt Paper 2 (randomized) to stabilise accuracy in periodic trends and table concepts.
  • Step 3 – Exam readiness: Attempt Paper 3 strictly within time. Target ≥ 70% and earn the certificate.
  • Step 4 – Review: Read solutions carefully, maintain a small error-log notebook, revise only missed ideas.
  • Step 5 – Retake smartly: Re-attempt after 1–2 days to test long-term recall and real improvement.

Important notes (read before you start)

  • Do not refresh / close the tab during the test.
  • Best experience: latest Chrome/Edge, stable internet, distraction-free screen.
  • Allow cookies / local storage so your progress and settings work smoothly.
  • Safety: This test is 100% FREE. Ignore any payment or login requests.

More practice for Class 11 Chemistry

After finishing this online test, strengthen your Chemistry further: visit the full Class 11 Chemistry Online Test Index or practice all chapters from the Class 11 Chemistry MCQ Collection.

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