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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 was the main idea behind Döbereiner’s Triads?

2 / 30

2. Why do noble gases have positive electron gain enthalpies?

3 / 30

3. Which superheavy element has the official name *Roentgenium*?

4 / 30

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

5 / 30

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

6 / 30

6. Which scientist in 1789 attempted one of the earliest classifications of 33 elements into metals and non-metals?

7 / 30

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

8 / 30

8. Which element shows variable valencies of +2 and +4?

9 / 30

9. Which of the following best describes metalloids?

10 / 30

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

11 / 30

11. Why are noble gases called "inert gases"?

12 / 30

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

13 / 30

13. Which element has the most negative electron gain enthalpy among the following?

14 / 30

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

15 / 30

15. Successive ionization enthalpies provide evidence for:

16 / 30

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

17 / 30

17. Which statement correctly distinguishes “d-block” from “transition element” in IUPAC terms?

18 / 30

18. Which element has the maximum electronegativity in the periodic table?

19 / 30

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

20 / 30

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

21 / 30

21. What was the official name given to element 116, earlier called *Ununhexium (Uuh)*?

22 / 30

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

23 / 30

23. Arrange in increasing order of radius: S²⁻, Cl⁻, K⁺, Ca²⁺.

24 / 30

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

25 / 30

25. Why is BeCl₂ covalent while MgCl₂ is ionic?

26 / 30

26. Which of the following is true for noble gases?

27 / 30

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

28 / 30

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

29 / 30

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

30 / 30

30. What is the general trend of ionization enthalpy 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. Why does beryllium behave differently from other alkaline earth metals?

2 / 50

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

3 / 50

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

4 / 50

4. Which triad consisted of halogens?

5 / 50

5. Which property is not periodic in nature?

6 / 50

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

7 / 50

7. Which property was mostly used by early chemists to group elements?

8 / 50

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

9 / 50

9. How many groups are present in the modern periodic table?

10 / 50

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

11 / 50

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

12 / 50

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

13 / 50

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

14 / 50

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

15 / 50

15. Which common property groups halogens together?

16 / 50

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

17 / 50

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

18 / 50

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

19 / 50

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

20 / 50

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

21 / 50

21. Why does lithium show different chemistry compared to other alkali metals?

22 / 50

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

23 / 50

23. Which of the following elements most commonly exhibits variable valency?

24 / 50

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

25 / 50

25. For p-block elements, how is group number related to valency?

26 / 50

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

27 / 50

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

28 / 50

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

29 / 50

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

30 / 50

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

31 / 50

31. Successive ionization enthalpies provide evidence for:

32 / 50

32. Which group elements generally exhibit valency 0?

33 / 50

33. Which block contains the inner transition elements?

34 / 50

34. Which of the following best defines metallic radius?

35 / 50

35. What is meant by ionization enthalpy?

36 / 50

36. The electronic configuration of an element is [Ne] 3s²3p⁵. To which group does it belong?

37 / 50

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

38 / 50

38. Why does nitrogen not form pentahalides like phosphorus?

39 / 50

39. Which group is also known as the chalcogens or oxygen family?

40 / 50

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

41 / 50

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

42 / 50

42. Which of the following elements shows the smallest covalent radius?

43 / 50

43. Which is a limitation of the Pauling scale?

44 / 50

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

45 / 50

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

46 / 50

46. What is the general trend of ionization enthalpy down a group?

47 / 50

47. Which superheavy element is named after Japan?

48 / 50

48. Which group is known as the noble gases?

49 / 50

49. Which groups are called transition elements?

50 / 50

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

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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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