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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. Which digit is represented by the root word “un” in IUPAC naming?

2 / 30

2. What is the symbol and name for element 115?

3 / 30

3. Mulliken’s electronegativity values are usually converted into Pauling’s scale by:

4 / 30

4. Which of the following elements shows the highest Mulliken electronegativity?

5 / 30

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

6 / 30

6. Approximately how many naturally occurring elements are known today?

7 / 30

7. Which major limitation was exposed in Mendeleev’s periodic law?

8 / 30

8. Who compiled the first list of elements with symbols and atomic weights, aiding in classification?

9 / 30

9. By the early 19th century, about how many elements were known to chemists?

10 / 30

10. Why is hydrogen sometimes placed in Group 1?

11 / 30

11. Why is oxygen able to form multiple bonds while sulfur prefers single bonds?

12 / 30

12. Why does boron not form simple ionic compounds like BCl₃⁻?

13 / 30

13. Why do transition elements often exhibit variable valency?

14 / 30

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

15 / 30

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

16 / 30

16. Arrange the following species in decreasing order of radius: Na, Na⁺, Cl, Cl⁻.

17 / 30

17. Which triad consisted of halogens?

18 / 30

18. Which of the following is a similarity between Li and Mg?

19 / 30

19. In the modern periodic table, where are noble gases placed?

20 / 30

20. Which property best explains the gradual change from metallic to non-metallic behavior across a period?

21 / 30

21. Why does atomic radius decrease across a period?

22 / 30

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

23 / 30

23. What is the general trend of atomic radius across a period in the periodic table?

24 / 30

24. What is meant by the second electron gain enthalpy?

25 / 30

25. What happens to ionic radius when an atom forms a cation?

26 / 30

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

27 / 30

27. Which of the following has the most negative first electron gain enthalpy?

28 / 30

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

29 / 30

29. What is the correct order of discovery in classification of elements?

30 / 30

30. What is the electronegativity value of fluorine on the Pauling scale?

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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. Arrange the following radii in decreasing order for a chlorine atom: van der Waals radius, metallic radius, covalent radius.

2 / 50

2. Which element is placed in Group 1 but also shows resemblance with Group 17 elements?

3 / 50

3. What is the root for digit 4 in the IUPAC system?

4 / 50

4. Why was Mendeleev’s classification widely accepted at that time?

5 / 50

5. Why is BeCl₂ covalent while MgCl₂ is ionic?

6 / 50

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

7 / 50

7. Why does lithium resemble magnesium more than sodium?

8 / 50

8. Who proposed the Law of Octaves in 1864?

9 / 50

9. Which digit is represented by the root “enn”?

10 / 50

10. Which unusual step did Mendeleev take to keep elements with similar properties together?

11 / 50

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

12 / 50

12. What is the van der Waals radius?

13 / 50

13. Which property shows similarity between B and Si?

14 / 50

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

15 / 50

15. Why was the classification of elements into families without considering atomic mass problematic?

16 / 50

16. Which of the following pairs shows amphoteric oxide formation due to diagonal relationship?

17 / 50

17. The electronic configuration of an element is [Kr] 4d¹⁰5s²5p⁵. To which group does it belong?

18 / 50

18. Which groups are called transition elements?

19 / 50

19. Why is the position of hydrogen unique in the periodic table?

20 / 50

20. In the modern periodic table, where are noble gases placed?

21 / 50

21. On what basis did Mendeleev arrange the elements in his periodic table?

22 / 50

22. Which of the following best summarizes the limitation of random classification?

23 / 50

23. What is the general trend of ionization enthalpy across a period?

24 / 50

24. Which of the following elements is NOT a metalloid?

25 / 50

25. What is the general valency of Group 2 elements?

26 / 50

26. Which is the heaviest element currently recognized in the periodic table?

27 / 50

27. Why can’t second-period elements expand their octet?

28 / 50

28. What is the general rule for writing symbols in IUPAC temporary names?

29 / 50

29. What is the root for digit 8 in IUPAC naming rules?

30 / 50

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

31 / 50

31. What does the IUPAC name *Unnilquadium (Unq)* represent?

32 / 50

32. Which of the following best describes metalloids?

33 / 50

33. Which superheavy element was named after the American state Tennessee?

34 / 50

34. What is the general outer configuration of Group 14 elements?

35 / 50

35. How did Mendeleev’s table help in unifying elements?

36 / 50

36. Which element was named *Meitnerium (Mt)* in honor of physicist Lise Meitner?

37 / 50

37. Which group of elements has the least negative electron gain enthalpies?

38 / 50

38. What is meant by the covalent radius of an atom?

39 / 50

39. Why was grouping by similar properties considered useful?

40 / 50

40. In an isoelectronic series (same number of electrons), how does ionic radius vary?

41 / 50

41. Which of the following is true about the growth in the number of elements?

42 / 50

42. The horizontal rows in the modern periodic table are called:

43 / 50

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

44 / 50

44. What is the electronegativity value of fluorine on the Pauling scale?

45 / 50

45. Why was random classification of elements considered unsatisfactory?

46 / 50

46. What is the general trend of atomic radius across a period in the periodic table?

47 / 50

47. Which period in the periodic table is the longest?

48 / 50

48. By the early 19th century, about how many elements were known to chemists?

49 / 50

49. Why is boron oxide (B₂O₃) acidic while aluminum oxide (Al₂O₃) is amphoteric?

50 / 50

50. Why do second-period elements form strong π-bonds more easily than heavier elements?

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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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