Exam-Style Online Test | Chapter: Classification Of Elements

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 transition elements often exhibit variable valency?

2 / 30

2. The maximum number of elements present in the 6th period of the periodic table is:

3 / 30

3. For d-block elements, how is the group number determined?

4 / 30

4. Which was the first element discovered in the 20th century?

5 / 30

5. Why was Mendeleev’s law eventually modified?

6 / 30

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

7 / 30

7. Which element is considered the lightest metal?

8 / 30

8. Which element was named after the scientist Nicolaus Copernicus?

9 / 30

9. Which group contains the alkaline earth metals?

10 / 30

10. Which property is common to both Be and Al due to diagonal relationship?

11 / 30

11. Newlands’ Octaves worked well for which set of elements?

12 / 30

12. Which group of elements has variable valency most commonly?

13 / 30

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

14 / 30

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

15 / 30

15. Which superheavy element is named after Japan?

16 / 30

16. Why is the first electron gain enthalpy of most non-metals negative?

17 / 30

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

18 / 30

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

19 / 30

19. Why does nitrogen not form pentahalides like phosphorus?

20 / 30

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

21 / 30

21. What is meant by valency of an element?

22 / 30

22. Which gas is placed in Group 18 but has an electronic configuration similar to Group 2?

23 / 30

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

24 / 30

24. What was the major advantage (pro) of the Modern Periodic Law?

25 / 30

25. Which is a similarity between Be and Al compounds?

26 / 30

26. Which pair shows diagonal similarity in forming covalent halides?

27 / 30

27. Why is atomic number considered more fundamental than atomic mass?

28 / 30

28. Which statement is correct about electron gain enthalpies?

29 / 30

29. Why was random classification of elements considered unsatisfactory?

30 / 30

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

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

2 / 50

2. Which of the following is generally the largest for the same atom?

3 / 50

3. How does the valency of elements change across a period in the periodic table?

4 / 50

4. Which anomaly of Mendeleev’s table was corrected by the Modern Periodic Law?

5 / 50

5. Which property shows similarity between B and Si?

6 / 50

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

7 / 50

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

8 / 50

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

9 / 50

9. Why is the second electron gain enthalpy always positive?

10 / 50

10. How many groups and periods were present in Mendeleev’s original table?

11 / 50

11. Which has the largest radius among the following: O²⁻, F⁻, Na⁺, Mg²⁺?

12 / 50

12. Which element has the most negative electron gain enthalpy?

13 / 50

13. Which of the following sets of elements was grouped together due to similar properties?

14 / 50

14. Why did classification purely on valency fail?

15 / 50

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

16 / 50

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

17 / 50

17. For s-block elements, how is the group number related to the number of valence electrons?

18 / 50

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

19 / 50

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

20 / 50

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

21 / 50

21. What is meant by valency of an element?

22 / 50

22. Why was random classification of elements considered unsatisfactory?

23 / 50

23. Why does atomic radius decrease across a period?

24 / 50

24. The configuration belongs to which block?

25 / 50

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

26 / 50

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

27 / 50

27. Which pair of elements was misplaced in Mendeleev’s table when arranged strictly by atomic mass?

28 / 50

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

29 / 50

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

30 / 50

30. Which element was named after the scientist Nicolaus Copernicus?

31 / 50

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

32 / 50

32. Which statement about d-block elements is correct?

33 / 50

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

34 / 50

34. Which group has the least negative electron gain enthalpy values?

35 / 50

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

36 / 50

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

37 / 50

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

38 / 50

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

39 / 50

39. Why do second-period elements form stronger hydrogen bonds than heavier elements?

40 / 50

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

41 / 50

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

42 / 50

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

43 / 50

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

44 / 50

44. Which common property groups halogens together?

45 / 50

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

46 / 50

46. Which element has the smallest atomic radius in Period 2?

47 / 50

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

48 / 50

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

49 / 50

49. What is the valency of carbon in methane (CH₄)?

50 / 50

50. Which element has the highest electronegativity on the Pauling scale?

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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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