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Saturday, 31 October

JEE Main · Chemistry · Chemical Kinetics

First Order Integrated Rate Law

JEE Main asked First Order Integrated Rate Law 13 times in 13 of the 108 shifts Lumi analysed, in 2020, 2021, 2022, 2024, 2025 and 2026. It belongs to Integrated Rate Equations, in Chemical Kinetics (Chemistry). The longest wait between two years asking it was 2 years. In 2020, 2021 and 2026 it came in more than one shift of the same year.

Updated 2026-10-24

Times asked
13
in 13 shifts
Years
6 of 8
First asked
2020
last in 2026
Pattern
Asked most years
across the analysed shifts

Questions on this idea a shift, by year

2017–2026. Asked in 2020, 2021, 2022, 2024, 2025 and 2026. Years differ in how many shifts Lumi analysed, so each year is scaled to one shift of 25 Chemistry questions.

00.150.30’170.17’200.21’210.03’220’230.05’240.13’250.22’26

Raw count: 2017: 0 in 1 shift · 2020: 2 in 12 shifts · 2021: 6 in 24 shifts · 2022: 1 in 24 shifts · 2023: 0 in 12 shifts · 2024: 1 in 18 shifts · 2025: 1 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
  • 20251 of 8
  • 20241 of 18
  • 20230 of 12
  • 20221 of 24
  • 20216 of 24
  • 20202 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
  • Time for concentration ratio of two first-order decays

Difficulty

Easy 4Medium 9Hard 0

11 of the 13 questions had a numerical answer.

Every question

All 13 questions

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

  1. 5 Apr 2026, Shift 1 · Q75If the half life of a first order reaction is 6.93 minutes then the time required for completion of 99% of the reaction will be ________…EasyNumerical value
  2. 4 Apr 2026, Shift 2 · Q74For a first order reaction A→B\mathrm{A\rightarrow B} [table: t/min = 0, x, 20; [A]/M = 0.6500, 0.0650, 0.00065] x=x= ________ min.…MediumNumerical value
  3. 2 Apr 2025, Shift 2 · Q71For the reaction A→BA \rightarrow B the following graph was obtained. The time required (in seconds) for the concentration of A to reduce…MediumNumerical valueHas a figure
  4. 30 Jan 2024, Shift 1 · Q87The rate of First order reaction is 0.04 mol L−1^{-1} s−1^{-1} at 10 minutes and 0.03 mol L−1^{-1} s−1^{-1} at 20 minutes after…MediumNumerical value
  5. 26 Jul 2022, Shift 2 · Q64At 30°C, the half life for the decomposition of AB2\mathrm{AB_2} is 200 s and is independent of the initial concentration of…MediumSingle correct
  6. 17 Mar 2021, Shift 1 · Q58For a certain first order reaction 32% of the reactant is left after 570 s. The rate constant of this reaction is __________…EasyNumerical value
  7. 16 Mar 2021, Shift 2 · Q58A and B decompose via first order kinetics with half-lives 54.0 min and 18.0 min respectively. Starting from an equimolar non reactive…MediumNumerical value
  8. 22 Jul 2021, Shift 2 · Q57N2O5(g)→2NO2(g)+12O2(g)\mathrm{N_2O_{5(g)} \rightarrow 2NO_{2(g)} + \frac{1}{2} O_{2(g)}} In the above first order reaction the initial concentration of…EasyNumerical value
  9. 24 Feb 2021, Shift 2 · Q57Sucrose hydrolyses in acid solution into glucose and fructose following first order rate law with a half-life of 3.33 h at 25∘25^\circC.…MediumNumerical value
  10. 31 Aug 2021, Shift 1 · Q56For a first order reaction, the ratio of the time for 75% completion of a reaction to the time for 50% completion is __________. (Integer…EasyNumerical value
  11. 3 Aug 2021, Shift 2 · Q57The inactivation process of virus is first order with respect to virus concentration and 2% of the virus was inactivated in the first one…MediumNumerical value
  12. 5 Sep 2020, Shift 1 · Q44A flask contains a mixture of compounds A and B. Both compounds decompose by first-order kinetics. The half-lives for A and B are 300 s…MediumSingle correct
  13. 4 Sep 2020, Shift 1 · Q48If 75% of a first order reaction was completed in 90 minutes, 60% of the same reaction would be completed in approximately (in minutes)…MediumNumerical value

Shifts: 4 Sep 2020, Shift 1, 5 Sep 2020, Shift 1, 24 Feb 2021, Shift 2, 16 Mar 2021, Shift 2, 17 Mar 2021, Shift 1, 22 Jul 2021, Shift 2, 3 Aug 2021, Shift 2, 31 Aug 2021, Shift 1, 26 Jul 2022, Shift 2, 30 Jan 2024, Shift 1, 2 Apr 2025, Shift 2, 4 Apr 2026, Shift 2, 5 Apr 2026, Shift 1.

Same topic

Other ideas in Integrated Rate Equations

Integrated Rate Equations has 15 ideas JEE Main has asked; 9 of them came up in more than one question. The 12 most asked are below.

Topic analysisChapter analysisStudy this chapterAll repeated ideas