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Saturday, 31 October

JEE Main · Chemistry · Chemical Kinetics

First-Order Kinetics

JEE Main asked First-Order Kinetics 2 times in 2 of the 108 shifts Lumi analysed, in 2022 and 2024. It belongs to Rate Laws, in Chemical Kinetics (Chemistry). The longest wait between two years asking it was 2 years.

Updated 2026-10-24

Times asked
2
in 2 shifts
Years
2 of 8
First asked
2022
last in 2024
Pattern
Occasional
across the analysed shifts

Questions on this idea a shift, by year

2017–2026. Asked in 2022 and 2024. Years differ in how many shifts Lumi analysed, so each year is scaled to one shift of 25 Chemistry questions.

00.050.10’170’200’210.03’220’230.05’240’250’26

Raw count: 2017: 0 in 1 shift · 2020: 0 in 12 shifts · 2021: 0 in 24 shifts · 2022: 1 in 24 shifts · 2023: 0 in 12 shifts · 2024: 1 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
  • 20241 of 18
  • 20230 of 12
  • 20221 of 24
  • 20210 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.

  • Time for fractional completion first order
  • Concentration ratio after time first order

Difficulty

Easy 1Medium 1Hard 0

2 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. 6 Apr 2024, Shift 2 · Q85Consider the two different first order reactions given below A+B→CA + B \rightarrow C (Reaction 1) P→QP \rightarrow Q (Reaction 2) The ratio…MediumNumerical value
  2. 28 Jul 2022, Shift 1 · Q86For the given first order reaction A→B\mathrm{A\to B} the half life of the reaction is 0.3010 min. The ratio of the initial concentration…EasyNumerical value

Shifts: 28 Jul 2022, Shift 1, 6 Apr 2024, Shift 2.

Same topic

Other ideas in Rate Laws

Rate Laws has 13 ideas JEE Main has asked; 4 of them came up in more than one question.

Topic analysisChapter analysisStudy this chapterAll repeated ideas