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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

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1 / 30

1. What did Mendeleev’s Periodic Law state?

2 / 30

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

3 / 30

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

4 / 30

4. Which superheavy element is named after Japan?

5 / 30

5. What is the first electron gain enthalpy of oxygen?

6 / 30

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

7 / 30

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

8 / 30

8. Which property was completely ignored in random classifications?

9 / 30

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

10 / 30

10. Why is the second ionization enthalpy always greater than the first?

11 / 30

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

12 / 30

12. Who gave the modern periodic law?

13 / 30

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

14 / 30

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

15 / 30

15. What is the second electron gain enthalpy of oxygen?

16 / 30

16. Why did scientists reject Newlands’ Law of Octaves initially?

17 / 30

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

18 / 30

18. Which block elements are called transition elements?

19 / 30

19. Why does the diagonal relationship exist in the periodic table?

20 / 30

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

21 / 30

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

22 / 30

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

23 / 30

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

24 / 30

24. Why does lithium resemble magnesium more than sodium?

25 / 30

25. Identify the block for the configuration .

26 / 30

26. Which element shows a sudden jump between second and third ionization enthalpies?

27 / 30

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

28 / 30

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

29 / 30

29. Which element is placed in Group 1 but also shows resemblance with Group 17 elements?

30 / 30

30. Which element shows a sudden jump between first and second ionization enthalpies?

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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. What is the most abundant element in the universe?

2 / 50

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

3 / 50

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

4 / 50

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

5 / 50

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

6 / 50

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

7 / 50

7. Which period contains the actinides?

8 / 50

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

9 / 50

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

10 / 50

10. Which pair of elements shows diagonal relationship in the periodic table?

11 / 50

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

12 / 50

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

13 / 50

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

14 / 50

14. Why does nitrogen not form pentahalides like phosphorus?

15 / 50

15. Which statement correctly compares Pauling and Mulliken scales?

16 / 50

16. Which element is considered the lightest metal?

17 / 50

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

18 / 50

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

19 / 50

19. What is meant by the diagonal relationship in the periodic table?

20 / 50

20. Identify the block for the configuration .

21 / 50

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

22 / 50

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

23 / 50

23. What is meant by the second electron gain enthalpy?

24 / 50

24. Why did classification purely on valency fail?

25 / 50

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

26 / 50

26. Which of the following elements is NOT a metalloid?

27 / 50

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

28 / 50

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

29 / 50

29. Which period contains the lanthanides?

30 / 50

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

31 / 50

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

32 / 50

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

33 / 50

33. Which factor increases ionization enthalpy across a period?

34 / 50

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

35 / 50

35. Why did Döbereiner’s Triads lose importance by the mid-19th century?

36 / 50

36. Why was grouping by similar properties considered useful?

37 / 50

37. Which group is called the alkali metals?

38 / 50

38. Which of the following pairs is an isoelectronic series?

39 / 50

39. Which common property groups halogens together?

40 / 50

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

41 / 50

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

42 / 50

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

43 / 50

43. Which triad consisted of halogens?

44 / 50

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

45 / 50

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

46 / 50

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

47 / 50

47. What are the common oxidation states of chromium?

48 / 50

48. The general electronic configuration of f-block elements is:

49 / 50

49. Which property is not periodic in nature?

50 / 50

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

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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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