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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. Which group is known as the noble gases?

2 / 30

2. Which groups are called transition elements?

3 / 30

3. Which block elements typically have the lowest ionization enthalpies in their respective periods and form strongly basic oxides/hydroxides?

4 / 30

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

5 / 30

5. Which statement best summarizes the significance of the Modern Periodic Law?

6 / 30

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

7 / 30

7. Which major limitation was exposed in Mendeleev’s periodic law?

8 / 30

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

9 / 30

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

10 / 30

10. What is meant by the covalent radius of an atom?

11 / 30

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

12 / 30

12. Why is fluorine the strongest oxidizing agent among the halogens?

13 / 30

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

14 / 30

14. Which was the simplest way of grouping elements in early classifications?

15 / 30

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

16 / 30

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

17 / 30

17. Which is a limitation of the Pauling scale?

18 / 30

18. What is meant by the first electron gain enthalpy of an element?

19 / 30

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

20 / 30

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

21 / 30

21. What is the valency of Group 17 elements?

22 / 30

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

23 / 30

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

24 / 30

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

25 / 30

25. How many elements are present in the 4th period of the periodic table?

26 / 30

26. Which group of elements has the lowest ionization enthalpies in the periodic table?

27 / 30

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

28 / 30

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

29 / 30

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

30 / 30

30. Which statement is correct about electron gain 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. In the isoelectronic series C⁴⁻, N³⁻, O²⁻, F⁻, which species has the smallest radius?

2 / 50

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

3 / 50

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

4 / 50

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

5 / 50

5. Which of the following factors does NOT affect ionization enthalpy?

6 / 50

6. How many elements did Newlands arrange while proposing his Law of Octaves?

7 / 50

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

8 / 50

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

9 / 50

9. What happens to ionic radius when an atom forms an anion?

10 / 50

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

11 / 50

11. Which anomaly did Mendeleev deliberately accept to keep elements with similar properties in the same group?

12 / 50

12. Why is lithium different from other alkali metals?

13 / 50

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

14 / 50

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

15 / 50

15. Which property shows similarity between B and Si?

16 / 50

16. Which of the following is a similarity between Li and Mg?

17 / 50

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

18 / 50

18. Which was a major limitation of grouping elements only by similar properties?

19 / 50

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

20 / 50

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

21 / 50

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

22 / 50

22. What is the general trend of atomic radius down a group?

23 / 50

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

24 / 50

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

25 / 50

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

26 / 50

26. Which set of elements was grouped together due to noble gas inertness?

27 / 50

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

28 / 50

28. How many elements are there in the first period?

29 / 50

29. What is the electronegativity value of fluorine on the Pauling scale?

30 / 50

30. Who gave the Modern Periodic Law in 1913?

31 / 50

31. Which period contains the lanthanides?

32 / 50

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

33 / 50

33. Identify the block for the configuration .

34 / 50

34. Which of the following is NOT a property of non-metals?

35 / 50

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

36 / 50

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

37 / 50

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

38 / 50

38. Which was the simplest way of grouping elements in early classifications?

39 / 50

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

40 / 50

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

41 / 50

41. Why does nitrogen not form pentahalides like phosphorus?

42 / 50

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

43 / 50

43. Which of the following groups of elements shows similar reactivity with water?

44 / 50

44. What is the van der Waals radius?

45 / 50

45. Which of the following best describes metalloids?

46 / 50

46. On what basis did Mendeleev arrange the elements in his periodic table?

47 / 50

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

48 / 50

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

49 / 50

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

50 / 50

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

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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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