Exam-Style Online Test | Chapter: Classification Of Elements

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 one of the major achievements of Mendeleev’s table?

2 / 30

2. Why is lithium different from other alkali metals?

3 / 30

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

4 / 30

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

5 / 30

5. Why does nitrogen not form pentahalides like phosphorus?

6 / 30

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

7 / 30

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

8 / 30

8. Which element has the smallest atomic radius in Period 2?

9 / 30

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

10 / 30

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

11 / 30

11. Which of the following is the official name of element 113?

12 / 30

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

13 / 30

13. The electronic configuration of an element is [Ar] 3d¹⁰4s²4p¹. Which group does it belong to?

14 / 30

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

15 / 30

15. What is the usual valency of oxygen?

16 / 30

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

17 / 30

17. If the ionization enthalpy of chlorine is 1251 kJ/mol and electron gain enthalpy is –349 kJ/mol, its Mulliken electronegativity is approximately:

18 / 30

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

19 / 30

19. Why does boron show chemistry very different from aluminum?

20 / 30

20. What is the position of hydrogen in the periodic table?

21 / 30

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

22 / 30

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

23 / 30

23. Which is the heaviest element currently recognized in the periodic table?

24 / 30

24. Which group has the least negative electron gain enthalpy values?

25 / 30

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

26 / 30

26. Why was the classification of elements into families without considering atomic mass problematic?

27 / 30

27. Why was Döbereiner’s Triad rule not universally applicable?

28 / 30

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

29 / 30

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

30 / 30

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

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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 property is common to both Be and Al due to diagonal relationship?

2 / 50

2. What is meant by electron gain enthalpy?

3 / 50

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

4 / 50

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

5 / 50

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

6 / 50

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

7 / 50

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

8 / 50

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

9 / 50

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

10 / 50

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

11 / 50

11. Which of the following is a metalloid?

12 / 50

12. What happens to electron gain enthalpy across a period from sodium to chlorine?

13 / 50

13. Why is BeCl₂ covalent while MgCl₂ is ionic?

14 / 50

14. Which of the following best describes metalloids?

15 / 50

15. Which is a unique property of second-period elements not observed in heavier congeners?

16 / 50

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

17 / 50

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

18 / 50

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

19 / 50

19. Which of the following is an example of misplacement in random classification?

20 / 50

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

21 / 50

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

22 / 50

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

23 / 50

23. What was the significance of Newlands’ Law of Octaves despite its limitations?

24 / 50

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

25 / 50

25. Which is the heaviest element currently recognized in the periodic table?

26 / 50

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

27 / 50

27. Which of the following sets of elements was grouped together due to similar properties?

28 / 50

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

29 / 50

29. Which oxidation states are commonly shown by manganese?

30 / 50

30. In which year did Döbereiner propose his Triad law?

31 / 50

31. Which of the following is the official name of element 113?

32 / 50

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

33 / 50

33. Which unusual step did Mendeleev take to keep elements with similar properties together?

34 / 50

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

35 / 50

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

36 / 50

36. Which superheavy element was named after the American state Tennessee?

37 / 50

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

38 / 50

38. Which of the following is true about the growth in the number of elements?

39 / 50

39. Which property best explains the gradual change from metallic to non-metallic behavior across a period?

40 / 50

40. Which property is not periodic in nature?

41 / 50

41. What is the official name of element 114?

42 / 50

42. Newlands’ Octaves worked well for which set of elements?

43 / 50

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

44 / 50

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

45 / 50

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

46 / 50

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

47 / 50

47. Which of the following best defines metallic radius?

48 / 50

48. Which pair of elements was misplaced in Mendeleev’s table when arranged strictly by atomic mass?

49 / 50

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

50 / 50

50. Why is the first electron gain enthalpy of most non-metals negative?

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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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