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Saturday, 31 October

JEE Main · Chemistry · Chemical Kinetics

Initial Rates Method

JEE Main asked Initial Rates Method 9 times in 9 of the 108 shifts Lumi analysed, in 2020, 2021, 2022, 2023 and 2024. It belongs to Rate Laws, in Chemical Kinetics (Chemistry). The longest wait between two years asking it was 1 year. In 2021, 2022 and 2024 it came in more than one shift of the same year.

Updated 2026-10-24

Times asked
9
in 9 shifts
Years
5 of 8
First asked
2020
last in 2024
Pattern
Asked most years
across the analysed shifts

Questions on this idea a shift, by year

2017–2026. Asked in 2020, 2021, 2022, 2023 and 2024. Years differ in how many shifts Lumi analysed, so each year is scaled to one shift of 25 Chemistry questions.

00.050.10’170.08’200.10’210.07’220.07’230.09’240’250’26

Raw count: 2017: 0 in 1 shift · 2020: 1 in 12 shifts · 2021: 3 in 24 shifts · 2022: 2 in 24 shifts · 2023: 1 in 12 shifts · 2024: 2 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
  • 20242 of 18
  • 20231 of 12
  • 20222 of 24
  • 20213 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.

  • Overall order from initial rate data
  • Order from rate-concentration data

Difficulty

Easy 4Medium 5Hard 0

7 of the 9 questions had a numerical answer.

Every question

All 9 questions

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

  1. 27 Jan 2024, Shift 1 · Q87Consider the following data for the given reaction 2 HI(g)→H2(g)+I2(g)\mathrm{2\ HI_{(g)} \rightarrow H_{2(g)} + I_{2(g)}} | 1 | 2 | 3…EasyNumerical value
  2. 5 Apr 2024, Shift 1 · Q85During Kinetic study of reaction 2A+B→C+D2\mathrm{A} + \mathrm{B} \rightarrow \mathrm{C} + \mathrm{D}, the following results were obtained : A…MediumNumerical valueHas a figure
  3. 11 Apr 2023, Shift 2 · Q63For a chemical reaction A + B →\to Product, the order is 1 with respect to A and B. | Rate mol L−1 S−1\mathrm{mol\ L^{-1}\ S^{-1}} | [A]…MediumSingle correctHas a figure
  4. 29 Jul 2022, Shift 1 · Q87The reaction between X and Y is first order with respect to X and zero order with respect to Y. Experiment | [X] mol L−1\mathrm{mol\ L^{-1}} |…MediumNumerical valueHas a figure
  5. 27 Jul 2022, Shift 1 · Q822NO+2H2→N2+2H2O\mathrm{2NO + 2H_2 \rightarrow N_2 + 2H_2O} The above reaction has been studied at 800∘800^\circC. The related data are given in the table…EasyNumerical value
  6. 18 Mar 2021, Shift 1 · Q572 NO(g)+Cl2(g)⇌2 NOCl(s)\mathrm{2\,NO(g) + Cl_2(g) \rightleftharpoons 2\,NOCl(s)} This reaction was studied at −10-10°C and the following data was obtained run |…MediumNumerical value
  7. 26 Aug 2021, Shift 1 · Q56The following data was obtained for chemical reaction given below at 975 K.…EasyNumerical value
  8. 3 Aug 2021, Shift 1 · Q57The following results have been obtained during the kinetic studies of the reaction. A + 2B ⟶ 2C Experiment | [A], mol L−1\mathrm{L^{-1}} |…EasyNumerical valueHas a figure
  9. 2 Sep 2020, Shift 2 · Q26The results given in the below table were obtained during kinetic studies of the following reaction :…MediumSingle correctHas a figure

Shifts: 2 Sep 2020, Shift 2, 18 Mar 2021, Shift 1, 3 Aug 2021, Shift 1, 26 Aug 2021, Shift 1, 27 Jul 2022, Shift 1, 29 Jul 2022, Shift 1, 11 Apr 2023, Shift 2, 27 Jan 2024, Shift 1, 5 Apr 2024, Shift 1.

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