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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 are noble gases called "inert gases"?

2 / 30

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

3 / 30

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

4 / 30

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

5 / 30

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

6 / 30

6. Which one of the following is the correct order of radii?

7 / 30

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

8 / 30

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

9 / 30

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

10 / 30

10. Which element has a higher ionization enthalpy: Be or B?

11 / 30

11. Why is hydrogen sometimes placed in Group 1?

12 / 30

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

13 / 30

13. Which of the following has the largest ionic radius?

14 / 30

14. Which of the following is an example of Döbereiner’s Triad?

15 / 30

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

16 / 30

16. What is the maximum number of elements that can appear consecutively in the s-block within any period?

17 / 30

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

18 / 30

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

19 / 30

19. Which period is considered the shortest in the periodic table?

20 / 30

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

21 / 30

21. How many triads were originally proposed by Döbereiner?

22 / 30

22. Why does lithium resemble magnesium more than sodium?

23 / 30

23. Which gas makes up about 78% of the Earth’s atmosphere?

24 / 30

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

25 / 30

25. Why does oxygen have less negative electron gain enthalpy than sulfur?

26 / 30

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

27 / 30

27. Which of the following elements has the highest first ionization enthalpy?

28 / 30

28. Which digit corresponds to the IUPAC root “tri”?

29 / 30

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

30 / 30

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

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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 limitation of Newlands’ Octaves showed its inadequacy?

2 / 50

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

3 / 50

3. Which oxidation states are commonly shown by tin (Sn)?

4 / 50

4. Which of the following pairs represents a non-metal and a metalloid, respectively?

5 / 50

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

6 / 50

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

7 / 50

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

8 / 50

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

9 / 50

9. Which of the following best describes metalloids?

10 / 50

10. Why did classification purely on valency fail?

11 / 50

11. Why do transition elements often exhibit variable valency?

12 / 50

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

13 / 50

13. Why do noble gases have almost zero electronegativity values?

14 / 50

14. Which group contains the most reactive non-metals?

15 / 50

15. Why is the radius of a cation always smaller than its parent atom?

16 / 50

16. Why is the ionization enthalpy of oxygen lower than that of nitrogen, despite oxygen’s higher nuclear charge?

17 / 50

17. Why does oxygen have less negative electron gain enthalpy than sulfur?

18 / 50

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

19 / 50

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

20 / 50

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

21 / 50

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

22 / 50

22. Which factor lowers ionization enthalpy down a group?

23 / 50

23. Why is the ionic radius of anions larger than their parent atoms?

24 / 50

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

25 / 50

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

26 / 50

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

27 / 50

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

28 / 50

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

29 / 50

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

30 / 50

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

31 / 50

31. Which common property groups halogens together?

32 / 50

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

33 / 50

33. Why does lithium resemble magnesium more than sodium?

34 / 50

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

35 / 50

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

36 / 50

36. Which digit corresponds to the IUPAC root “sept”?

37 / 50

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

38 / 50

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

39 / 50

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

40 / 50

40. Why could random classification not help in predicting new elements?

41 / 50

41. Which superheavy element is named after a Russian region?

42 / 50

42. Which of the following pairs are isoelectronic species?

43 / 50

43. According to Newlands’ Law of Octaves, the properties of which elements were similar?

44 / 50

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

45 / 50

45. Which block elements are called transition elements?

46 / 50

46. Which superheavy element is named after Japan?

47 / 50

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

48 / 50

48. Which period contains the actinides?

49 / 50

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

50 / 50

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

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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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