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Saturday, 31 October

JEE Main · Chemistry · Surface Chemistry

Freundlich Isotherm Equation

JEE Main asked Freundlich Isotherm Equation 2 times in 2 of the 108 shifts Lumi analysed, all in 2021. It belongs to Adsorption, in Surface Chemistry (Chemistry). In 2021 it came in more than one shift of the same year.

Updated 2026-10-24

Times asked
2
in 2 shifts
Years
1 of 8
First asked
2021
the only year
Pattern
Gone quiet
across the analysed shifts

Questions on this idea a shift, by year

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

00.050.10’170’200.07’210’220’230’240’250’26

Raw count: 2017: 0 in 1 shift · 2020: 0 in 12 shifts · 2021: 2 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
  • 20212 of 24
  • 20200 of 12
  • 20170 of 1

Asked in that shift More than once Not asked

How JEE Main framed it

Numerical value is the usual form. Skill tested: calculation.

  • Freundlich isotherm adsorbed volume
  • Definition recall

Difficulty

Easy 1Medium 1Hard 0

1 of the 2 questions had a numerical answer.

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. 25 Feb 2021, Shift 1 · Q34In Freundlich adsorption isotherm at moderate pressure, the extent of adsorption (xm)\left(\frac{x}{m}\right) is directly proportional to…EasySingle correct
  2. 31 Aug 2021, Shift 2 · Q58CH4\mathrm{CH_4} is adsorbed on 1 g charcoal at 0°C following the Freundlich adsorption isotherm. 10.0 mL of CH4\mathrm{CH_4} is adsorbed at…MediumNumerical value

Shifts: 25 Feb 2021, Shift 1, 31 Aug 2021, Shift 2.

Same topic

Other ideas in Adsorption

Adsorption has 13 ideas JEE Main has asked; 10 of them came up in more than one question.

Topic analysisChapter analysisAll repeated ideas