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Sunday, 25 October

JEE Main · Chemistry · Chemical Kinetics

Rate Laws: JEE Main previous year questions

29 questions in the 108 JEE Main shifts Lumi analysed, in 7 of 8 years. Pattern: Asked most years. 11 came in 2024–26. Here is how it is asked and which ideas come back.

Questions
29
in 29 of 108 shifts
Years asked
7/8
last asked 2026
Chance in a shift
19%
calibrated model, how we compute it
Weighted estimate
0.2
model; history: 0.2 a shift on average, typically 0.1–0.3

Key findings

  1. 01

    Asked in 7 of 8 years with analysed shifts and in 29 of 108 shifts: 29 questions, #117 of 196 topics.

  2. 02

    45% of its questions since 2020 tested an idea no earlier year had asked; 15 repeated an idea from the year before.

  3. 03

    The most repeated idea is Initial Rates Method, asked 9 times in 9 shifts (2020, 2021, 2022, 2023, 2024), most often as “overall order from initial rate data”.

  4. 04

    JEE Main has asked 13 of the 51 ideas in this topic; 33 have never been asked, directly or inside another question.

  5. 05

    Mostly asked as numerical value (69%); 69% need a numerical answer, 48% are easy and 0% hard.

  6. 06

    The skill tested most is calculation (55%), then data or graph (17%).

Questions a shift, year by year

Out of the 25 Chemistry questions in a shift. Years differ in how many shifts Lumi analysed, so each year is scaled to one shift.

00.250.50’170.3’200.2’210.2’220.2’230.4’240.3’250.1’26

Raw count: 2017: 0 in 1 shift · 2020: 3 in 12 shifts · 2021: 7 in 24 shifts · 2022: 5 in 24 shifts · 2023: 3 in 12 shifts · 2024: 8 in 18 shifts · 2025: 2 in 8 shifts · 2026: 1 in 9 shifts.

Up to 2023
0.2
a shift, of 25
Since 2024
0.2
0.1
Usual gap
1.0 yrs
between years asking it
Shifts with it
29/108
27% of analysed shifts

How it is asked

Difficulty, format and skill

Across all 29 questions on Rate Laws since 2017.

Difficulty

QUESTIONS
1415
  • Easy14 · 48%
  • Medium15 · 52%
  • Hard0 · 0%

Format

SHARE
  • Numerical value · 20 Q69%
  • Single correct · 8 Q28%
  • Diagram based · 1 Q3%

Skill tested

SHARE
  • Calculation · 16 Q55%
  • Data or graph · 5 Q17%
  • Conceptual · 5 Q17%
  • Multi-step · 2 Q7%
  • Application · 1 Q3%

Repeats

New idea, or one asked before?

Each column is a year. Blue questions tested an idea no earlier year had asked; navy ones went back to an idea from an earlier year. 2017 is the first year, so everything in it counts as new. Heights are question counts, and Lumi analysed 1 to 24 shifts a year, so compare the split inside a column rather than heights across years.

3
7
5
3
8
2
1
’17’20’21’22’23’24’25’26
  • Idea asked for the first time
  • Idea asked in an earlier year

Coverage of the topic

JEE Main has asked 13 of the 51 ideas in this topic. 33 have never been asked yet.

13533
  • Asked directly13 · 25%
  • Touched inside another question5 · 10%
  • Never asked33 · 65%

Ideas come from Lumi’s JEE syllabus map. A never-asked idea is not a safe skip: across all of JEE Main, 22% of questions since 2024 tested an idea no earlier year had asked.

Drill down

Idea, year, question

Every idea JEE Main tested in this topic, with its eight years. Open one to read the questions.

  • OpenRepeated9 · 31%322
    • 5 Apr ’24 S1 · Q85
      During Kinetic study of reaction 2A+B→C+D2\mathrm{A} + \mathrm{B} \rightarrow \mathrm{C} + \mathrm{D}, the following results were obtained : A…

      mediumNumerical valueAsked the year before

    • 27 Jan ’24 S1 · Q87
      Consider 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 valueAsked the year before

    • 11 Apr ’23 S2 · Q63
      For 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 correctAsked the year before

    • 27 Jul ’22 S1 · Q82
      2NO+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 valueAsked the year before

    • 29 Jul ’22 S1 · Q87
      The 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 valueAsked the year before

    • 3 Aug ’21 S1 · Q57
      The following results have been obtained during the kinetic studies of the reaction. A + 2B ⟶ 2C Experiment | [A], mol L−1\mathrm{L^{-1}} |…

      easyNumerical valueAsked the year before

    • 26 Aug ’21 S1 · Q56
      The following data was obtained for chemical reaction given below at 975 K.…

      easyNumerical valueAsked the year before

    • 18 Mar ’21 S1 · Q57
      2 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 valueAsked the year before

    • 2 Sep ’20 S2 · Q26
      The results given in the below table were obtained during kinetic studies of the following reaction :…

      mediumSingle correctNew idea

  • OpenRepeated7 · 24%22
  • OpenRepeated2 · 7%
  • OpenRepeated2 · 7%
  • Open1 · 3%
  • Open1 · 3%
  • Open1 · 3%
  • Open1 · 3%
  • Open1 · 3%
  • Open1 · 3%
  • Open1 · 3%
  • Open1 · 3%
  • Open1 · 3%

Squares are the 8 years with analysed shifts, 2017 to 2026. A number is the questions that year when there is more than one; the shade is scaled to one shift, so a year with more analysed shifts (1 to 24 a year) does not look darker. Share is of the level above.

Ideas

Every idea inside this topic

13 different ideas were tested; 4 came more than once.

Times and shifts count every analysed shift. Across JEE Main, 78% of questions since 2024 went back to an idea an earlier year had asked; the rest were new. All repeated ideas

Every question

Rate Laws questions, year by year

The opening words of each question as it appeared in the official paper, with the idea it tested. Open one for its options and the official answer.

JEE Main 20248 questions in 8 shifts

JEE Main 20233 questions in 3 shifts

JEE Main 20225 questions in 5 shifts

JEE Main 20217 questions in 7 shifts

Questions from the official JEE Main Paper 1 shifts published by NTA (CBSE for 2017). Questions NTA dropped are left out. Topic and idea tags, counts and notes are Lumi’s.

More topics in Chemical Kinetics

ChapterChemical Kinetics115 questions in all; Rate Laws is 25% of them. Weightage, every topic and every question.All topics196 JEE Main topicsFilter by subject, unit and repeat pattern