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Saturday, 31 October

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

Penetration Effect on Ionization Enthalpy

JEE Main asked Penetration Effect on Ionization Enthalpy 2 times in 2 of the 108 shifts Lumi analysed, in 2020 and 2021. It belongs to Periodic Trends, in Classification of Elements and Periodicity in Properties (Chemistry). The longest wait between two years asking it was 1 year.

Updated 2026-10-24

Times asked
2
in 2 shifts
Years
2 of 8
First asked
2020
last in 2021
Pattern
Gone quiet
across the analysed shifts

Questions on this idea a shift, by year

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

00.050.10’170.08’200.03’210’220’230’240’250’26

Raw count: 2017: 0 in 1 shift · 2020: 1 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: 0 in 9 shifts.

Shift by shift

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

  • 20260 of 9
  • 20250 of 8
  • 20240 of 18
  • 20230 of 12
  • 20220 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.

  • Order of first ionization energies
  • Order of first ionisation enthalpy

Difficulty

Easy 1Medium 1Hard 0

Every question was multiple choice.

Every question

All 2 questions

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

  1. 24 Feb 2021, Shift 1 · Q33Consider the elements Mg, Al, S, P and Si, the correct increasing order of their first ionization enthalpy is :MediumSingle correct
  2. 8 Jan 2020, Shift 1 · Q32The first ionization energy (in kJ/mol) of Na, Mg, Al and Si respectively, are :EasySingle correct

Shifts: 8 Jan 2020, Shift 1, 24 Feb 2021, Shift 1.

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