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Saturday, 31 October

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

Successive Ionization Enthalpy Jumps

JEE Main asked Successive Ionization Enthalpy Jumps 5 times in 5 of the 108 shifts Lumi analysed, in 2020, 2021 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 5 years. In 2020 and 2026 it came in more than one shift of the same year.

Updated 2026-10-24

Times asked
5
in 5 shifts
Years
3 of 8
First asked
2020
last in 2026
Pattern
Frequent
across the analysed shifts

Questions on this idea a shift, by year

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

00.150.30’170.17’200.03’210’220’230’240’250.22’26

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

Shift by shift

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

  • 20262 of 9
  • 20250 of 8
  • 20240 of 18
  • 20230 of 12
  • 20220 of 24
  • 20211 of 24
  • 20202 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: data or graph.

  • Statement i/ii on ionization enthalpy trends
  • Estimate successive ionization enthalpy

Difficulty

Easy 4Medium 1Hard 0

Every question was multiple choice.

Every question

All 5 questions

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

  1. 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
  2. 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
  3. 16 Mar 2021, Shift 2 · Q36Identify the elements X and Y using the ionisation energy values given below : Ionization energy (kJ/mol) 1st 2nd X 495 4563 Y 731 1450EasySingle correct
  4. 3 Sep 2020, Shift 2 · Q32The five successive ionization enthalpies of an element are 800, 2427, 3658, 25024 and 32824 kJ mol−1\mathrm{kJ\ mol^{-1}}. The number of…EasySingle correct
  5. 9 Jan 2020, Shift 2 · Q32The first and second ionisation enthalpies of a metal are 496 and 4560 kJ mol−1^{-1}, respectively. How many moles of HCl and…EasySingle correct

Shifts: 9 Jan 2020, Shift 2, 3 Sep 2020, Shift 2, 16 Mar 2021, Shift 2, 2 Apr 2026, Shift 1, 4 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