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Sunday, 25 October

JEE Main · Chemistry · Class 11

Classification of Elements and Periodicity in Properties: JEE Main previous year questions

98 questions in 86 of the 108 JEE Main shifts Lumi analysed, asked in 8 of 8 years. Here is what this chapter tests and how.

Study this chapter
Questions
98
in 86 of 108 shifts · 8 of 8 years
Average a shift
0.9
of 25 Chemistry · 1.1 since 2024 0.3
Typical range
0.6–1.1
questions a shift; fewest 0.6, most 1.2
Weighted estimate
1.0
model, recent years count more · about 4 marks
  • Typical range (fact)
  • Average a shift (fact)
  • Weighted estimate (model)

Questions are counted per shift, out of the 25 each subject has, in the shifts Lumi analysed; papers that offered 30 a subject (2017, 2021–2024) are scaled to 25. Typical range: the middle six of the eight years (2017, 2020–2026), leaving out the single highest and lowest year. The average and the range are historical fact. The weighted estimate is a model: each year's share, with recent years counting more (half-life three years), and chapters NTA dropped from the syllabus set near zero. It is a guide to effort, not a forecast of the paper.

What to do

How to spend time on Classification of Elements and Periodicity in Properties

Priority

Lower priority

One of the 6 Chemistry chapters that shared the last fifth of Chemistry questions in the 108 shifts analysed. How bands are set

Past questions
98in 86 of 108 shifts
Study plan gives it
14 hover 12 months; 10 h over 6
Study this chapter →

Ideas asked most often

  1. Ionization Enthalpy Trends14×
  2. Electron Gain Enthalpy10×
  3. Isoelectronic Species Radii Comparison10×
  4. p-Block Ionization Enthalpy Inversions8×
  5. Atomic and Ionic Radii Trends6×

11 of the 44 ideas in Lumi’s map of this chapter have not been asked or touched in the shifts analysed. Of its idea-tagged questions from 2024 on, 9% tested an idea not asked in an earlier year, so learn the whole chapter, not just the list above.

Within each subject, chapters in NTA's 2026 syllabus are ranked by their average questions a shift over all 8 years analysed (history, not the model). Going down that list, the chapters that together held the first half of the subject's questions are Must do; the next ones, up to 80%, are Should do; the rest are Lower priority.

Key findings

Classification of Elements and Periodicity in Properties at a glance

  1. 01

    91%

    of its 35 questions from 2024 on that Lumi matched to an idea tested one JEE Main had asked in an earlier year; 100% came from a topic asked in an earlier year.

  2. 02

    25%

    of the 44 ideas in Lumi's map of the chapter have not been asked or touched on in the shifts analysed.

  3. 03

    5%

    of its questions asked for a numerical answer, 0.2 times the Chemistry average.

  4. 04

    1%

    of its questions were rated hard, against 6% across all Chemistry questions in the same shifts.

Questions a shift, year by year

Out of the 25 Chemistry questions in a shift. Years differ in how many shifts Lumi analysed, so each year is scaled to one shift.

0240.8’171.2’200.6’210.6’220.6’231’241.1’251’26

Raw count: 2017: 1 in 1 shift · 2020: 14 in 12 shifts · 2021: 17 in 24 shifts · 2022: 18 in 24 shifts · 2023: 8 in 12 shifts · 2024: 22 in 18 shifts · 2025: 9 in 8 shifts · 2026: 9 in 9 shifts.

Kind of question

SHARE OF QUESTIONS
  • Conceptual30%
  • Recall, single correct27%
  • Application11%
  • Two statements10%
  • Match the list7%
  • Assertion–reason6%
  • Numerical answer5%
  • Multi-step2%
  • Data or graph2%

Most common asks: order/ranking of ionic radii (4); order/ranking of electron gain enthalpy (4); count correct statements on periodic trends (4).

Profile

This chapter in numbers

Where it ranks, how steady it is, and what it costs to study.

Rank, all JEE chapters
#39
of 70 by weighted estimate
Rank in Chemistry
#17
of 21 chapters
Share of Chemistry
3.5%
of its questions, all shifts analysed
Busiest year
2020
1.2 questions a shift
Year to year
Some swing
varies by about 0.2 questions a shift
Long-run direction
+0.02
questions a shift, per year
Easy questions
62%
1% rated hard
Numerical answer
5%
0.2× the Chemistry rate
With a figure
1%
graph, diagram or structure
Study time
14 h
10 h on a 6-month plan
Marks per study hour
0.29
#3 of 70 chapters
Foundation for others
14%
of its ideas are used in other chapters

Difficulty, year by year

Each question rated easy, medium or hard. Each bar is that year’s split, so years compare directly; the number is the questions in that year’s analysed shifts (1 to 24 shifts a year).

  • 20171
  • 202014
  • 202117
  • 202218
  • 20238
  • 202422
  • 20259
  • 20269
  • Easy
  • Medium
  • Hard

What it asks you to do

SHARE OF QUESTIONS
  • Conceptual43%
  • Recall35%
  • Application14%
  • Calculation3%
  • Data or graph3%
  • Multi-step2%

Coverage

How much of the chapter JEE Main has used

We split the chapter into 44 ideas. In the 108 shifts analysed, JEE Main built a question around 25 of them. 43% of the chapter has never been the main idea of a question, so past questions alone leave part of it out.

Asked as the main idea
25
Touched on in a question
8
Never asked
11

Topics

What repeats, topic by topic

This chapter's questions per topic in each year's analysed shifts. The number is the count; the shade is scaled to one shift, so a year with more analysed shifts (1 to 24 a year) does not look darker. 9 questions had no close topic in Lumi's map and count for the chapter only.

’17’20’21’22’23’24’25’26
016+questions in that year’s analysed shifts, shaded per shift
  • Periodic Trends

    As a topic: 99 questions in 7 of 8 years, most often single correct, 5% numerical answer. Recent asks: match list on ionization enthalpy values; numerical: energy from successive ionization enthalpies; periodic trend across a period.

  • Quantum Numbers

    As a topic: 52 questions in 8 of 8 years, most often single correct, 29% numerical answer. Recent asks: match list on orbital nodes; count correct statements on atomic structure; count correct statements on orbitals.

  • Group 13 & 14

    As a topic: 38 questions in 7 of 8 years, most often single correct, 3% numerical answer.

  • Enthalpy and Hess's Law

    As a topic: 62 questions in 8 of 8 years, most often numerical value, 74% numerical answer. Recent asks: numerical: enthalpy of reaction from formation enthalpies; numerical: enthalpy of formation from bomb calorimetry; statement I/II on heat capacities of ideal gas.

Drill down

Topic, idea, question

Open a topic to see every idea JEE Main tested inside it, then open an idea to read the questions. Each row shows its 8 years.

  • Open78 · 80%12151561668

    17 ideas inside

    • OpenRepeated13 · 17%2423
    • OpenRepeated10 · 13%233
    • OpenRepeated10 · 13%422
    • OpenRepeated8 · 10%24
    • OpenRepeated6 · 8%23
    • OpenRepeated5 · 6%2
    • OpenRepeated5 · 6%22
    • OpenRepeated4 · 5%2
    • OpenRepeated4 · 5%2
    • OpenRepeated3 · 4%
    • OpenRepeated2 · 3%
    • OpenRepeated2 · 3%
    • OpenRepeated2 · 3%
    • Open1 · 1%
    • Open1 · 1%
    • Open1 · 1%
    • Open1 · 1%
  • Open5 · 5%2
  • Open4 · 4%2
  • Open1 · 1%
  • Open1 · 1%

Squares are the 8 years with analysed shifts, 2017 to 2026. A number is the questions that year when there is more than one; the shade is scaled to one shift, so a year with more analysed shifts (1 to 24 a year) does not look darker. Share is of the level above.

Ideas

The exact ideas JEE Main has asked

Inside the topics, 22 different ideas were tested; 15 came more than once. These are the repeats, then the ideas new since 2024.

Dots are the 8 years with analysed shifts, 2017 to 2026.

Every question

All 98 Classification of Elements and Periodicity in Properties questions

Newest first, shift by shift. The newest 40 show their opening words; older ones name the idea they tested. Each opens with its options and the official answer.

JEE Main 20269 questions

  1. 2 Apr 2026, Shift 1 · Q59Given below are two statements : Statement (I) : The first ionisation enthalpy of the elements Na, Mg, Cl and Ar follows the order Na > Mg…MediumTwo statements
  2. 4 Apr 2026, Shift 1 · Q58A monoatomic anion (A−\mathrm{A^-}) has 4545 neutrons and 3636 electrons. Atomic mass, group in the periodic table and physical state at…EasySingle correct
  3. 4 Apr 2026, Shift 2 · Q57The 1st1^{\text{st}} ionization enthalpy for Mg is +737 kJ/mol. The most probable estimated value of the 2nd2^{\text{nd}} ionization…EasySingle correct
  4. 5 Apr 2026, Shift 1 · Q58Given below are two statements: Statement I: The correct order of electronegativity of fluorine, oxygen and nitrogen is F > O > N.…EasyTwo statements
  5. 5 Apr 2026, Shift 2 · Q53The covalent radii of atoms A and B are rAr_A and rBr_B, respectively. The covalent bond length and total length of AB molecule are…MediumSingle correct
  6. 5 Apr 2026, Shift 2 · Q58Given below are two statements : Statement I : The number of pairs among [Al2O3,Cr2O3]\mathrm{[Al_2O_3, Cr_2O_3]}, [Cl2O7,Mn2O7]\mathrm{[Cl_2O_7, Mn_2O_7]},…MediumTwo statements
  7. 6 Apr 2026, Shift 1 · Q71First and second ionization enthalpies of lithium are 520 kJ mol−1^{-1} and 7297 kJ mol−1^{-1} respectively. Energy required to convert…EasyNumerical value
  8. 6 Apr 2026, Shift 2 · Q58In a period, the first ionisation enthalpy of the element at extreme left and the negative electron gain enthalpy of the extreme right…EasySingle correct
  9. 8 Apr 2026, Shift 2 · Q58Match List - I with List - II. List - I (Electronic configuration of neutral atom (where n = 2)) | List - II (1st^{st} Ionization Energy…MediumMatch the list

JEE Main 20259 questions

  1. 2 Apr 2025, Shift 1 · Q58The property/properties that show irregularity in first four elements of group-17 is/are : (A) Covalent radius (B) Electron affinity (C)…MediumOther
  2. 2 Apr 2025, Shift 1 · Q59Given below are two statements : Statement (I) : The metallic radius of Al is less than that of Ga. Statement (II) : The ionic radius of…MediumTwo statements
  3. 2 Apr 2025, Shift 2 · Q58Electronic configuration of four elements A, B, C and D are given below : (A) 1s22s22p31s^22s^22p^3 (B) 1s22s22p41s^22s^22p^4 (C) 1s22s22p51s^22s^22p^5 (D)…EasySingle correct
  4. 3 Apr 2025, Shift 1 · Q60Which of the following statements are correct ? A. The process of adding an electron to a neutral gaseous atom is always exothermic. B.…MediumOther
  5. 3 Apr 2025, Shift 2 · Q59Match the LIST-I with LIST-II LIST-I (Family) A. Pnictogen (group 15) B. Chalcogen C. Halogen D. Noble gas LIST-II (Symbol of Element) I.…MediumMatch the list
  6. 3 Apr 2025, Shift 2 · Q60The correct orders among the following are A. Atomic radius : B < Al < Ga < In < Tl B. Electronegativity : Al < Ga < In < Tl < B C.…MediumOther
  7. 4 Apr 2025, Shift 2 · Q57The elements of Group 13 with highest and lowest first ionisation enthalpies are respectively :EasySingle correct
  8. 7 Apr 2025, Shift 2 · Q59Choose the incorrect trend in the atomic radii (r) of the elements.EasySingle correct
  9. 8 Apr 2025, Shift 2 · Q56The atomic number of the element from the following with lowest 1st^{st} ionisation enthalpy is :EasySingle correct

JEE Main 202422 questions

  1. 4 Apr 2024, Shift 1 · Q66The correct order of first ionization enthalpy values of the following elements is : (A) O (B) N (C) Be (D) F (E) B Choose the correct…MediumOther
  2. 4 Apr 2024, Shift 1 · Q67Number of elements from the following that CANNOT form compounds with valencies which match with their respective group valencies is…MediumSingle correct
  3. 4 Apr 2024, Shift 2 · Q66Given below are two statements : Statement I : The correct order of first ionization enthalpy values of Li, Na, F and Cl is Na < Li < Cl <…MediumTwo statements
  4. 4 Apr 2024, Shift 2 · Q67The correct order of the first ionization enthalpy isMediumSingle correct
  5. 5 Apr 2024, Shift 1 · Q66The statement(s) that are correct about the species O2−\mathrm{O^{2-}}, F−\mathrm{F^-}, Na+\mathrm{Na^+} and Mg2+\mathrm{Mg^{2+}}. (A) All are…EasyOther
  6. 5 Apr 2024, Shift 2 · Q66Given below are two statements : Statement I : The metallic radius of Na is 1.86 A∘1.86\ \mathrm{A^\circ} and the ionic radius of…EasyTwo statements
  7. 6 Apr 2024, Shift 1 · Q66The electron affinity value are negative for A. Be→Be−\mathrm{Be \rightarrow Be^-} B. N→N−\mathrm{N \rightarrow N^-} C.…MediumOther
  8. 6 Apr 2024, Shift 2 · Q69Arrange the following elements in the increasing order of number of unpaired electrons in it. (A) Sc (B) Cr (C) V (D) Ti (E) Mn Choose the…EasyOther
  9. 8 Apr 2024, Shift 1 · Q68Match List I with List II LIST I (Elements): A. Cl, S; B. Ge, As; C. Fr, Ra; D. F, O LIST II (Properties in their respective groups): I.…MediumMatch the list
  10. 8 Apr 2024, Shift 2 · Q66Identify the correct statements about p-block elements and their compounds. (A) Non metals have higher electronegativity than metals. (B)…EasyOther
  11. 9 Apr 2024, Shift 2 · Q67Match List I with List II List I (Element) | List II (Electronic Configuration) A. N | I. [Ar] 3d10 4s2 4p5[\mathrm{Ar}]\,3d^{10}\,4s^2\,4p^5 B. S | II.…EasyMatch the list
  12. 9 Apr 2024, Shift 2 · Q68Match List I with List II List I | List II A. Melting Point [K] | I. Tl>In>Ga>Al>B\mathrm{Tl>In>Ga>Al>B} B. Ionic Radius [M+3\mathrm{M^{+3}}/pm] | II.…HardMatch the list
  13. 1 Feb 2024, Shift 1 · Q65In case of isoelectronic species the size of F−\mathrm{F^-}, Ne and Na+\mathrm{Na^+} is affected by :EasySingle correct
  14. 1 Feb 2024, Shift 2 · Q65Given below are two statements : Statement (I) : Both metals and non-metals exist in p and d-block elements. Statement (II) : Non-metals…EasyTwo statements
  15. 27 Jan 2024, Shift 1 · Q64Given below are two statements : Statement (I) : The 4f4f and 5f5f - series of elements are placed separately in the Periodic table to…EasyTwo statements
  16. 27 Jan 2024, Shift 1 · Q65Element not showing variable oxidation state is :EasySingle correct
  17. 29 Jan 2024, Shift 1 · Q64Given below are two statements : one is labelled as Assertion A and the other is labelled as Reason R : Assertion A : The first ionisation…EasyAssertion–reason
  18. 30 Jan 2024, Shift 1 · Q65Given below are two statements : one is labelled as Assertion (A) and the other is labelled as Reason (R). Assertion (A) : There is a…MediumAssertion–reason
  19. 30 Jan 2024, Shift 1 · Q88If IUPAC name of an element is "Unununnium" then the element belongs to nth^{th} group of Periodic table. The value of n is ________.EasyNumerical value
  20. 30 Jan 2024, Shift 2 · Q66Given below are two statements: Statement - I: Along the period, the chemical reactivity of the elements gradually increases from group 1…EasyTwo statements
  21. 31 Jan 2024, Shift 1 · Q66The correct sequence of electron gain enthalpy of the elements listed below is A. Ar B. Br C. F D. S Choose the most appropriate from the…MediumOther
  22. 31 Jan 2024, Shift 2 · Q66Consider the following elements. Group ↓\downarrow A' B' →\rightarrow Period C' D' Which of the following is/are true about A', B', C'…MediumOtherHas a figure

JEE Main 20238 questions

  1. 6 Apr 2023, Shift 1 · Q64Positive Electron Gain Enthalpy · Medium · Single correct
  2. 6 Apr 2023, Shift 2 · Q64Gallium Melting Point Anomaly · Medium · Single correct
  3. 8 Apr 2023, Shift 1 · Q64Electronegativity Scales · Medium · Single correct
  4. 10 Apr 2023, Shift 2 · Q64Metallic and Non-Metallic Character Trends · Easy · Single correct
  5. 10 Apr 2023, Shift 2 · Q68Open the question · Medium · Assertion–reason
  6. 11 Apr 2023, Shift 1 · Q64p-Block Ionization Enthalpy Inversions · Easy · Single correct
  7. 13 Apr 2023, Shift 1 · Q64Electron Gain Enthalpy · Medium · Other
  8. 15 Apr 2023, Shift 1 · Q87Isoelectronic Species Radii Comparison · Easy · Numerical value

JEE Main 202218 questions

  1. 25 Jul 2022, Shift 1 · Q66IUPAC Nomenclature for Z > 100 · Medium · Single correct
  2. 25 Jul 2022, Shift 2 · Q66p-Block Ionization Enthalpy Inversions · Easy · Single correct
  3. 26 Jul 2022, Shift 1 · Q63Van der Waals vs Covalent vs Metallic Radii · Medium · Two statements
  4. 27 Jul 2022, Shift 1 · Q66Ionization Enthalpy Trends · Medium · Single correct
  5. 27 Jul 2022, Shift 2 · Q66p-Block Ionization Enthalpy Inversions · Medium · Single correct
  6. 28 Jul 2022, Shift 1 · Q65Electron Gain Enthalpy · Medium · Other
  7. 28 Jul 2022, Shift 2 · Q32Metallic and Non-Metallic Character Trends · Easy · Single correct
  8. 29 Jul 2022, Shift 1 · Q64p-Block Ionization Enthalpy Inversions · Medium · Single correct
  9. 30 Jul 2022, Shift 2 · Q35Ionization Enthalpy Trends · Easy · Other
  10. 25 Jun 2022, Shift 1 · Q63Isoelectronic Species Configurations · Easy · Single correct
  11. 25 Jun 2022, Shift 2 · Q66Electron Gain Enthalpy · Medium · Single correct
  12. 26 Jun 2022, Shift 2 · Q63Open the question · Easy · Single correct
  13. 27 Jun 2022, Shift 1 · Q65Isoelectronic Species Radii Comparison · Easy · Assertion–reason
  14. 27 Jun 2022, Shift 2 · Q65Isoelectronic Species Radii Comparison · Easy · Single correct
  15. 28 Jun 2022, Shift 1 · Q63Predicting Periodic Table Position · Easy · Single correct
  16. 28 Jun 2022, Shift 2 · Q66Acidic and Basic Character of Oxides · Easy · Match the list
  17. 29 Jun 2022, Shift 2 · Q66p-Block Ionization Enthalpy Inversions · Easy · Assertion–reason
  18. 30 Jun 2022, Shift 1 · Q66Electron Gain Enthalpy · Easy · Single correct

JEE Main 202117 questions

  1. 4 Aug 2021, Shift 1 · Q35p-Block Ionization Enthalpy Inversions · Easy · Single correct
  2. 4 Aug 2021, Shift 2 · Q32Positive Electron Gain Enthalpy of Noble Gases · Easy · Single correct
  3. 27 Aug 2021, Shift 2 · Q32Isoelectronic Species Radii Comparison · Easy · Single correct
  4. 31 Aug 2021, Shift 1 · Q35Metallic and Non-Metallic Character Trends · Easy · Assertion–reason
  5. 24 Feb 2021, Shift 1 · Q33Penetration Effect on Ionization Enthalpy · Medium · Single correct
  6. 25 Feb 2021, Shift 1 · Q57Born-Haber Cycle for Lattice Enthalpy · Easy · Numerical value
  7. 26 Feb 2021, Shift 1 · Q33p-Block Ionization Enthalpy Inversions · Medium · Match the list
  8. 26 Feb 2021, Shift 2 · Q33Electron Gain Enthalpy · Medium · Single correct
  9. 22 Jul 2021, Shift 2 · Q34Open the question · Easy · Single correct
  10. 25 Jul 2021, Shift 1 · Q33Isoelectronic Species Radii Comparison · Easy · Single correct
  11. 25 Jul 2021, Shift 2 · Q34Isoelectronic Species Radii Comparison · Easy · Single correct
  12. 16 Mar 2021, Shift 2 · Q33Metallic and Non-Metallic Character Trends · Medium · Single correct
  13. 16 Mar 2021, Shift 2 · Q36Successive Ionization Enthalpy Jumps · Easy · Single correct
  14. 17 Mar 2021, Shift 1 · Q33Electron Gain Enthalpy · Easy · Single correct
  15. 17 Mar 2021, Shift 2 · Q34Diagonal Relationship · Easy · Single correct
  16. 18 Mar 2021, Shift 1 · Q34Isoelectronic Species Radii Comparison · Easy · Single correct
  17. 18 Mar 2021, Shift 2 · Q34Ionization Enthalpy Trends · Easy · Single correct

JEE Main 202014 questions

  1. 8 Jan 2020, Shift 1 · Q32Penetration Effect on Ionization Enthalpy · Easy · Single correct
  2. 8 Jan 2020, Shift 2 · Q32Atomic and Ionic Radii Trends · Easy · Single correct
  3. 9 Jan 2020, Shift 1 · Q32Ionization Enthalpy Trends · Medium · Other
  4. 9 Jan 2020, Shift 1 · Q34Acidic and Basic Character of Oxides · Easy · Single correct
  5. 9 Jan 2020, Shift 2 · Q32Successive Ionization Enthalpy Jumps · Easy · Single correct
  6. 2 Sep 2020, Shift 1 · Q32Atomic and Ionic Radii Trends · Easy · Single correct
  7. 2 Sep 2020, Shift 2 · Q32Acidic and Basic Character of Oxides · Easy · Single correct
  8. 3 Sep 2020, Shift 1 · Q32IUPAC Nomenclature for Z > 100 · Easy · Single correct
  9. 3 Sep 2020, Shift 2 · Q32Successive Ionization Enthalpy Jumps · Easy · Single correct
  10. 4 Sep 2020, Shift 1 · Q32Isoelectronic Species Radii Comparison · Easy · Single correct
  11. 4 Sep 2020, Shift 1 · Q36Open the question · Medium · Single correct
  12. 4 Sep 2020, Shift 2 · Q32Positive Electron Gain Enthalpy · Easy · Single correct
  13. 5 Sep 2020, Shift 1 · Q33Aufbau Principle and n+l Rule · Easy · Single correct
  14. 6 Sep 2020, Shift 2 · Q46IUPAC Nomenclature for Z > 100 · Easy · Numerical value

JEE Main 20171 question

  1. 2 Apr 2017 (offline) · Q45Configurations of Isoelectronic Species · Easy · Single correct

Questions from the official JEE Main papers published by NTA. Chapter, topic and idea tags, counts and notes are Lumi’s. Pattern: Asked most years.

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