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

2 / 30

2. Which common property groups halogens together?

3 / 30

3. What is the temporary IUPAC name for element with atomic number 118?

4 / 30

4. Who gave the Modern Periodic Law in 1913?

5 / 30

5. In an isoelectronic series, what is the general trend of ionic radius?

6 / 30

6. According to IUPAC nomenclature, which root word represents the digit 0?

7 / 30

7. Which ion among Al³⁺, Mg²⁺, and Na⁺ has the smallest size?

8 / 30

8. Which of the following is NOT an example of a Döbereiner triad?

9 / 30

9. How many elements are there in the first period?

10 / 30

10. According to Mulliken’s definition, electronegativity is:

11 / 30

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

12 / 30

12. Which of the following pairs shows an exception to the general periodic trend in ionization enthalpy?

13 / 30

13. What is meant by successive ionization enthalpies?

14 / 30

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

15 / 30

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

16 / 30

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

17 / 30

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

18 / 30

18. What did Mendeleev’s Periodic Law state?

19 / 30

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

20 / 30

20. By the mid-19th century, approximately how many elements had been discovered?

21 / 30

21. Why could isotopes not be accommodated properly in Mendeleev’s table?

22 / 30

22. Which property is common among all metals?

23 / 30

23. Which block elements typically have the lowest ionization enthalpies in their respective periods and form strongly basic oxides/hydroxides?

24 / 30

24. Which feature of Mendeleev’s periodic table allowed noble gases to be easily accommodated after their discovery?

25 / 30

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

26 / 30

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

27 / 30

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

28 / 30

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

29 / 30

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

30 / 30

30. What is the general trend of atomic radius down a group?

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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. In which year did Döbereiner propose his Triad law?

2 / 50

2. Which triad consisted of halogens?

3 / 50

3. Which block elements typically have the lowest ionization enthalpies in their respective periods and form strongly basic oxides/hydroxides?

4 / 50

4. Why is hydrogen sometimes placed in Group 1?

5 / 50

5. According to Pauling, electronegativity difference () between two atoms is related to which measurable property?

6 / 50

6. How did Moseley experimentally determine atomic number?

7 / 50

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

8 / 50

8. Which ion among Al³⁺, Mg²⁺, and Na⁺ has the smallest size?

9 / 50

9. Which of the following factors does NOT affect ionization enthalpy?

10 / 50

10. What is the position of hydrogen in the periodic table?

11 / 50

11. Why is the van der Waals radius larger than the covalent radius?

12 / 50

12. Which group contains elements that exist as diatomic non-metal molecules under normal conditions?

13 / 50

13. Which of the following has a positive first electron gain enthalpy?

14 / 50

14. Why was classification based only on metals and non-metals insufficient?

15 / 50

15. Which superheavy element is named after Japan?

16 / 50

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

17 / 50

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

18 / 50

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

19 / 50

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

20 / 50

20. Which of the following factors makes electron gain enthalpy more negative?

21 / 50

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

22 / 50

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

23 / 50

23. Which of the following is a disadvantage (con) of the Modern Periodic Law?

24 / 50

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

25 / 50

25. Which element is known as the "bridge element" between s-block and p-block?

26 / 50

26. Who gave the Modern Periodic Law in 1913?

27 / 50

27. Which group contains the alkaline earth metals?

28 / 50

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

29 / 50

29. Why was Döbereiner’s Triad rule not universally applicable?

30 / 50

30. Which element has the lowest electronegativity?

31 / 50

31. Why was the IUPAC system of naming elements beyond atomic number 100 introduced?

32 / 50

32. What is the general trend of electronegativity down a group?

33 / 50

33. Which of the following is the official name of element 113?

34 / 50

34. What did Mendeleev’s Periodic Law state?

35 / 50

35. Which of the following is NOT a property of non-metals?

36 / 50

36. In an isoelectronic series, which factor is most important in determining size?

37 / 50

37. Why is the electron gain enthalpy of fluorine less negative than chlorine?

38 / 50

38. Why does carbon form stable multiple bonds, but silicon prefers single bonds?

39 / 50

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

40 / 50

40. By the mid-19th century, approximately how many elements had been discovered?

41 / 50

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

42 / 50

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

43 / 50

43. Which of the following is a unique property of lithium compared to other alkali metals?

44 / 50

44. Why is BeCl₂ covalent while MgCl₂ is ionic?

45 / 50

45. How many elements are present in the 4th period of the periodic table?

46 / 50

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

47 / 50

47. Which anomaly did Mendeleev deliberately accept to keep elements with similar properties in the same group?

48 / 50

48. Which factor increases ionization enthalpy across a period?

49 / 50

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

50 / 50

50. Which of the following pairs shows the same valency as their group number?

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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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