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Saturday, 31 October

JEE Main · Chemistry · Classification of Elements and Periodicity in Properties

Ionization Enthalpy Trends

JEE Main asked Ionization Enthalpy Trends 14 times in 14 of the 108 shifts Lumi analysed, in 2020, 2021, 2022, 2024, 2025 and 2026. It belongs to Periodic Trends, in Classification of Elements and Periodicity in Properties (Chemistry). The longest wait between two years asking it was 2 years. In 2022, 2024, 2025 and 2026 it came in more than one shift of the same year.

Updated 2026-10-24

Times asked
14
in 14 shifts
Years
6 of 8
First asked
2020
last in 2026
Pattern
Asked most years
across the analysed shifts

Questions on this idea a shift, by year

2017–2026. Asked in 2020, 2021, 2022, 2024, 2025 and 2026. Years differ in how many shifts Lumi analysed, so each year is scaled to one shift of 25 Chemistry questions.

00.30.60’170.08’200.03’210.07’220’230.19’240.25’250.44’26

Raw count: 2017: 0 in 1 shift · 2020: 1 in 12 shifts · 2021: 1 in 24 shifts · 2022: 2 in 24 shifts · 2023: 0 in 12 shifts · 2024: 4 in 18 shifts · 2025: 2 in 8 shifts · 2026: 4 in 9 shifts.

Shift by shift

Each square is one analysed shift, in date order. Open a filled one for that paper.

  • 20264 of 9
  • 20252 of 8
  • 20244 of 18
  • 20230 of 12
  • 20222 of 24
  • 20211 of 24
  • 20201 of 12
  • 20170 of 1

Asked in that shift More than once Not asked

How JEE Main framed it

Single correct is the usual form. Skill tested: conceptual.

  • Count correct statements on periodic trends
  • Statement i/ii on ionization enthalpy trends

Difficulty

Easy 7Medium 7Hard 0

1 of the 14 questions had a numerical answer.

Every question

All 14 questions

From the official JEE Main shift papers, newest first. Open one for the full question, the options and the official answer.

  1. 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
  2. 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
  3. 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
  4. 2 Apr 2026, Shift 2 · Q59Given below are two statements: Statement I: The second ionization enthalpy of B, Al and Ga is in the order of B > Al > Ga. Statement II:…MediumSingle correct
  5. 8 Apr 2025, Shift 2 · Q56The atomic number of the element from the following with lowest 1st^{st} ionisation enthalpy is :EasySingle correct
  6. 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
  7. 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
  8. 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
  9. 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
  10. 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
  11. 30 Jul 2022, Shift 2 · Q35For Periodic Table which of the following statements are TRUE A. Shielding increases as we go down in the group. B. Shielding increases…EasyOther
  12. 27 Jul 2022, Shift 1 · Q66The incorrect statement isMediumSingle correct
  13. 18 Mar 2021, Shift 2 · Q34The first ionization energy of magnesium is smaller as compared to that of elements X and Y, but higher than that of Z. The elements X, Y…EasySingle correct
  14. 9 Jan 2020, Shift 1 · Q32B has a smaller first ionization enthalpy than Be. Consider the following statements : (I) it is easier to remove 2p electron than 2s…MediumOther

Shifts: 9 Jan 2020, Shift 1, 18 Mar 2021, Shift 2, 27 Jul 2022, Shift 1, 30 Jul 2022, Shift 2, 29 Jan 2024, Shift 1, 1 Feb 2024, Shift 2, 4 Apr 2024, Shift 2, 4 Apr 2024, Shift 1, 3 Apr 2025, Shift 1, 8 Apr 2025, Shift 2, 2 Apr 2026, Shift 2, 6 Apr 2026, Shift 2, 6 Apr 2026, Shift 1, 8 Apr 2026, Shift 2.

Same topic

Other ideas in Periodic Trends

Periodic Trends has 25 ideas JEE Main has asked; 17 of them came up in more than one question. The 12 most asked are below.

Topic analysisChapter analysisStudy this chapterAll repeated ideas