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

2 / 30

2. What is the root for digit 6 in IUPAC element naming?

3 / 30

3. Which property distinguishes beryllium hydroxide from other Group 2 hydroxides?

4 / 30

4. Who proposed the Law of Octaves in 1864?

5 / 30

5. Why did Mendeleev leave gaps in his periodic table?

6 / 30

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

7 / 30

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

8 / 30

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

9 / 30

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

10 / 30

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

11 / 30

11. Which of the following pairs best demonstrates Newlands’ Octaves?

12 / 30

12. Which group numbers correspond to the s-block?

13 / 30

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

14 / 30

14. Who gave the Modern Periodic Law in 1913?

15 / 30

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

16 / 30

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

17 / 30

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

18 / 30

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

19 / 30

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

20 / 30

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

21 / 30

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

22 / 30

22. Which statement is correct about electron gain enthalpies?

23 / 30

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

24 / 30

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

25 / 30

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

26 / 30

26. In the isoelectronic series C⁴⁻, N³⁻, O²⁻, F⁻, which species has the smallest radius?

27 / 30

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

28 / 30

28. Why does lithium carbonate decompose easily compared to sodium carbonate?

29 / 30

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

30 / 30

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

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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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Get new questions with every attempt

  • 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 important scientific principle was missing from random classification?

2 / 50

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

3 / 50

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

4 / 50

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

5 / 50

5. What is the relation between metallic radius and covalent radius for the same element?

6 / 50

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

7 / 50

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

8 / 50

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

9 / 50

9. Which element was formerly called *Ununhexium (Uuh)*?

10 / 50

10. In general, what happens to successive ionization enthalpies for the same atom?

11 / 50

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

12 / 50

12. Who introduced the most widely used scale of electronegativity?

13 / 50

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

14 / 50

14. What does the Modern Periodic Law state?

15 / 50

15. Why is lithium different from other alkali metals?

16 / 50

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

17 / 50

17. Why do second-period elements often show anomalous properties compared to heavier congeners?

18 / 50

18. Why was Mendeleev’s law eventually modified?

19 / 50

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

20 / 50

20. Which group is known as the halogens?

21 / 50

21. What mathematical relation did Döbereiner observe in his triads?

22 / 50

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

23 / 50

23. Which gas forms about 21% of Earth’s atmosphere?

24 / 50

24. The configuration belongs to which block?

25 / 50

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

26 / 50

26. What was one of the major achievements of Mendeleev’s table?

27 / 50

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

28 / 50

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

29 / 50

29. Which element was once called *Ununseptium (Uus)*?

30 / 50

30. Which property was completely ignored in random classifications?

31 / 50

31. Which of the following elements has a valency equal to 3?

32 / 50

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

33 / 50

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

34 / 50

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

35 / 50

35. Why does lithium carbonate decompose easily compared to sodium carbonate?

36 / 50

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

37 / 50

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

38 / 50

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

39 / 50

39. Why does beryllium form covalent compounds instead of ionic ones like other Group 2 metals?

40 / 50

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

41 / 50

41. Which period contains the lanthanides?

42 / 50

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

43 / 50

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

44 / 50

44. What is the most abundant element in the universe?

45 / 50

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

46 / 50

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

47 / 50

47. Which of the following elements has the lowest electronegativity?

48 / 50

48. What is the maximum valency shown by sulfur?

49 / 50

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

50 / 50

50. Which of the following is a general property of metals?

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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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