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Saturday, 31 October

JEE Main · Chemistry · States of Matter

Dalton's Law

JEE Main asked Dalton's Law 7 times in 7 of the 108 shifts Lumi analysed, in 2020, 2021, 2022 and 2025. It belongs to Ideal Gas Laws, in States of Matter (Chemistry). The longest wait between two years asking it was 3 years. In 2021 and 2022 it came in more than one shift of the same year.

Updated 2026-10-24

Times asked
7
in 7 shifts
Years
4 of 8
First asked
2020
last in 2025
Pattern
Comes in cycles
across the analysed shifts

Questions on this idea a shift, by year

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

00.10.20’170.08’200.07’210.10’220’230’240.13’250’26

Raw count: 2017: 0 in 1 shift · 2020: 1 in 12 shifts · 2021: 2 in 24 shifts · 2022: 3 in 24 shifts · 2023: 0 in 12 shifts · 2024: 0 in 18 shifts · 2025: 1 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
  • 20251 of 8
  • 20240 of 18
  • 20230 of 12
  • 20223 of 24
  • 20212 of 24
  • 20201 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.

  • Partial pressure ratios from mass percent
  • Pressure of moist gas after expansion

Difficulty

Easy 4Medium 3Hard 0

5 of the 7 questions had a numerical answer.

Every question

All 7 questions

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

  1. 7 Apr 2025, Shift 1 · Q51At the sea level, the dry air mass percentage composition is given as nitrogen gas: 70.0, oxygen gas: 27.0 and argon gas: 3.0. If total…MediumSingle correct
  2. 29 Jul 2022, Shift 2 · Q81‘x’ g of molecular oxygen (O2\mathrm{O_2}) is mixed with 200 g of neon (Ne). The total pressure of the non-reactive mixture of…EasyNumerical value
  3. 26 Jul 2022, Shift 1 · Q82A mixture of hydrogen and oxygen contains 40% hydrogen by mass when the pressure is 2.2 bar. The partial pressure of hydrogen is…MediumNumerical value
  4. 25 Jul 2022, Shift 1 · Q83The pressure of a moist gas at 27∘27^\circC is 44 atm. The volume of the container is doubled at the same temperature. The new pressure of…MediumNumerical value
  5. 17 Mar 2021, Shift 1 · Q52The pressure exerted by a non-reactive gaseous mixture of 6.4 g of methane and 8.8 g of carbon dioxide in a 10 L vessel at 27∘27^\circC is…EasyNumerical value
  6. 4 Aug 2021, Shift 2 · Q52A gaseous mixture of helium and oxygen contains 20% helium by weight. If the partial pressure of oxygen in the mixture is 5 atm, the…EasyNumerical value
  7. 3 Sep 2020, Shift 2 · Q31A mixture of one mole each of H2\mathrm{H_2}, He and O2\mathrm{O_2} each are enclosed in a cylinder of volume V at temperature T. If the…EasySingle correct

Shifts: 3 Sep 2020, Shift 2, 17 Mar 2021, Shift 1, 4 Aug 2021, Shift 2, 25 Jul 2022, Shift 1, 26 Jul 2022, Shift 1, 29 Jul 2022, Shift 2, 7 Apr 2025, Shift 1.

Same topic

Other ideas in Ideal Gas Laws

Ideal Gas Laws has 11 ideas JEE Main has asked; 6 of them came up in more than one question.

Topic analysisChapter analysisAll repeated ideas