JEE Main · Chemistry · The d- and f-Block Elements
Ionization Enthalpy Irregularities
JEE Main asked Ionization Enthalpy Irregularities 3 times in 3 of the 108 shifts Lumi analysed, in 2024, 2025 and 2026. It belongs to d-Block Elements, in The d- and f-Block Elements (Chemistry). The longest wait between two years asking it was 1 year.
Updated 2026-10-24
- Times asked
- 3
- in 3 shifts
- Years
- 3 of 8
- First asked
- 2024
- last in 2026
- Pattern
- New since 2024
- across the analysed shifts
Questions on this idea a shift, by year
2017–2026. Asked in 2024, 2025 and 2026. Years differ in how many shifts Lumi analysed, so each year is scaled to one shift of 25 Chemistry questions.
Raw count: 2017: 0 in 1 shift · 2020: 0 in 12 shifts · 2021: 0 in 24 shifts · 2022: 0 in 24 shifts · 2023: 0 in 12 shifts · 2024: 1 in 18 shifts · 2025: 1 in 8 shifts · 2026: 1 in 9 shifts.
Shift by shift
Each square is one analysed shift, in date order. Open a filled one for that paper.
How JEE Main framed it
Single correct is the usual form. Skill tested: conceptual.
- Statement i/ii on ionization enthalpy and cfse
- Incorrect ionisation enthalpy relationship among 3d ions
Difficulty
Every question was multiple choice.
Every question
All 3 questions
From the official JEE Main shift papers, newest first. Open one for the full question, the options and the official answer.
- 2 Apr 2026, Shift 2 · Q60Given below are two statements: Statement I: Among Zn, Mn, Sc and Cu, the energy required to remove the third valence electron is highest…MediumSingle correct
- 4 Apr 2025, Shift 2 · Q61The incorrect relationship in the following pairs in relation to ionisation enthalpies is :MediumSingle correct
- 1 Feb 2024, Shift 2 · Q68The transition metal having highest ionisation enthalpy is :MediumSingle correct
Shifts: 1 Feb 2024, Shift 2, 4 Apr 2025, Shift 2, 2 Apr 2026, Shift 2.
Same topic
Other ideas in d-Block Elements
d-Block Elements has 31 ideas JEE Main has asked; 21 of them came up in more than one question. The 12 most asked are below.
- Spin-only Magnetism23× · 2026
- Acid-Base Character of Oxides8× · 2025
- Oxidation State Trends8× · 2025
- Color and Catalysis7× · 2026
- Permanganate Reactions5× · 2024
- Standard Electrode Potential Trends5× · 2023
- Enthalpy of Atomization4× · 2026
- Ionization Enthalpy Irregularities4× · 2026
- Electronic Configuration4× · 2024
- Specific KMnO4 Oxidations in Neutral/Alkaline Medium4× · 2024
- Dichromate Reactions3× · 2026
- Specific d-Block Industrial Catalysts3× · 2026