JEE Main · Chemistry · Chemical Kinetics
Integrated Rate Equations: JEE Main previous year questions
50 questions in the 108 JEE Main shifts Lumi analysed, in 7 of 8 years. Pattern: Asked most years. 23 came in 2024–26. Here is how it is asked and which ideas come back.
- Questions
- 50
- in 48 of 108 shifts
- Years asked
- 7/8
- last asked 2026
- Weighted estimate
- 0.6
- model; history: 0.4 a shift on average, typically 0.2–0.8
Key findings
- 01
Asked in 7 of 8 years with analysed shifts and in 48 of 108 shifts: 50 questions, #58 of 196 topics.
- 02
46% of its questions since 2020 tested an idea no earlier year had asked; 21 repeated an idea from the year before.
- 03
The most repeated idea is First Order Integrated Rate Law, asked 13 times in 13 shifts (2020, 2021, 2022, 2024, 2025, 2026), most often as “time for fractional completion first order”.
- 04
JEE Main has asked 15 of the 49 ideas in this topic; 29 have never been asked, directly or inside another question.
- 05
Mostly asked as numerical value (74%); 74% need a numerical answer, 36% are easy and 4% hard. It went up from 0.2 to 0.7 questions a shift since 2024.
- 06
The skill tested most is calculation (60%), then multi-step (24%).
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.
Raw count: 2017: 0 in 1 shift · 2020: 2 in 12 shifts · 2021: 10 in 24 shifts · 2022: 11 in 24 shifts · 2023: 4 in 12 shifts · 2024: 8 in 18 shifts · 2025: 6 in 8 shifts · 2026: 9 in 9 shifts.
- Up to 2023
- 0.2
- a shift, of 25
- Since 2024
- 0.7
- +0.5
- Usual gap
- 1.0 yrs
- between years asking it
- Shifts with it
- 48/108
- 44% of analysed shifts
Recent framings
- numerical: percentage remaining after half-lives
- rate constant from total pressure data
- numerical: time for fractional completion first order
Revise first
- First Order Integrated Rate Law · asked 2020, 2021, 2022, 2024, 2025, 2026
- Gas Kinetics with Complex Stoichiometry · asked 2021, 2023, 2024, 2025, 2026
- Concentration After n Half-Lives · asked 2025, 2026
How it is asked
Difficulty, format and skill
Across all 50 questions on Integrated Rate Equations since 2017.
Difficulty
QUESTIONS- Easy18 · 36%
- Medium30 · 60%
- Hard2 · 4%
Format
SHARE- Numerical value · 37 Q74%
- Single correct · 11 Q22%
- Other · 1 Q2%
- Diagram based · 1 Q2%
Skill tested
SHARE- Calculation · 30 Q60%
- Multi-step · 12 Q24%
- Data or graph · 5 Q10%
- Conceptual · 3 Q6%
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.
- Idea asked for the first time
- Idea asked in an earlier year
Coverage of the topic
JEE Main has asked 15 of the 49 ideas in this topic. 29 have never been asked yet.
- Asked directly15 · 31%
- Touched inside another question5 · 10%
- Never asked29 · 59%
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
Chapter, idea, question
Every idea JEE Main tested in this topic, with its eight years. Open one to read the questions.
15 ideas inside
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
15 different ideas were tested; 9 came more than once.
time for fractional completion first order
Numerical value · 13 shifts · 11 numericalpartial pressure from total pressure data
Numerical value · 6 shifts · 4 numericaltime for fractional completion first order
Numerical value · 6 shifts · 5 numericalage from fractional radioactive content
Numerical value · 6 shifts · 6 numericalpercentage remaining after half-lives
Single correct · 3 shifts · 1 numericalhalf-life from linear graph
Numerical value · 3 shifts · 3 numericalorder from half-lives at two concentrations
Numerical value · 3 shifts · 3 numericaltrue statement selection on kinetics graph
Diagram based · 2 shiftstime for zero order change from half-life
Numerical value · 2 shifts · 1 numericalexpression for fraction decomposed
Single correct · 1 shiftrate constant from total pressure data
Single correct · 1 shiftrelation between completion time and half-life
Single correct · 1 shifttime for fractional completion first order
Numerical value · 1 shift · 1 numericaltime for fractional completion in parallel first order reactions
Numerical value · 1 shift · 1 numericalamount remaining after time for first order decay
Numerical value · 1 shift · 1 numerical
| Idea | Years asked | Times | Shifts | Format | Numerical |
|---|---|---|---|---|---|
| First Order Integrated Rate Lawtime for fractional completion first order | 13 | 13 | Numerical valueCalculation | 11 | |
| Gas Kinetics with Complex Stoichiometrypartial pressure from total pressure data | 6 | 6 | Numerical valueMulti-step | 4 | |
| First Order Fractional Completion Shortcutstime for fractional completion first order | 6 | 6 | Numerical valueCalculation | 5 | |
| First Order Half-Lifeage from fractional radioactive content | 6 | 6 | Numerical valueCalculation | 6 | |
| Concentration After n Half-Livespercentage remaining after half-lives | 3 | 3 | Single correctCalculation | 1 | |
| Zero Order Half-Lifehalf-life from linear graph | 3 | 3 | Numerical valueConceptual | 3 | |
| Nth-Order Half-Life Proportionalityorder from half-lives at two concentrations | 3 | 3 | Numerical valueCalculation | 3 | |
| Kinetic Graphical Identificationtrue statement selection on kinetics graph | 2 | 2 | Diagram basedData or graph | – | |
| Zero Order Integrated Rate Lawtime for zero order change from half-life | 2 | 2 | Numerical valueCalculation | 1 | |
| First Order Exponential Formexpression for fraction decomposed | 1 | 1 | Single correctConceptual | – | |
| Gas Phase First-Order Kineticsrate constant from total pressure data | 1 | 1 | Single correctMulti-step | – | |
| Zero Order Reaction Completion Timerelation between completion time and half-life | 1 | 1 | Single correctConceptual | – | |
| First Order Fractional Life Relationshipstime for fractional completion first order | 1 | 1 | Numerical valueCalculation | 1 | |
| Parallel First-Order Effective Rate Constanttime for fractional completion in parallel first order reactions | 1 | 1 | Numerical valueCalculation | 1 | |
| Concentration After N Half-Livesamount remaining after time for first order decay | 1 | 1 | Numerical valueCalculation | 1 |
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
Integrated Rate Equations questions, year by year
The newest 40 show their opening words as they appeared in the official paper; older ones name the idea they tested. Open one for its options and the official answer.
JEE Main 20269 questions in 7 shifts
- 2 Apr, Shift 1Q58is the time required for the completion of the reaction while is the time required for of the…
Idea: Zero Order Reaction Completion Time
New ideaMediumSingle correct - 2 Apr, Shift 2Q72Consider the following gas phase reaction being carried out in a closed vessel at 25°C. | time (min)…
Idea: Gas Kinetics with Complex Stoichiometry
Asked the year beforeMediumNumerical value - 4 Apr, Shift 1Q57Consider the first order reaction . The fraction of molecules decomposed in the given first order…
Idea: First Order Exponential Form
New ideaEasySingle correct - 4 Apr, Shift 2Q63Consider the given graph showing variation of reactant concentration with time. Three different reactions were started with identical…
Idea: Kinetic Graphical Identification
MediumSingle correct · figure - 4 Apr, Shift 2Q74For a first order reaction [table: t/min = 0, x, 20; [A]/M = 0.6500, 0.0650, 0.00065] ________ min.…
Idea: First Order Integrated Rate Law
Asked the year beforeMediumNumerical value - 5 Apr, Shift 1Q57First order gas phase reaction = initial pressure of gas A, = total pressure of the reaction…
Idea: Gas Phase First-Order Kinetics
New ideaMediumSingle correct - 5 Apr, Shift 1Q75If 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 ________…
Idea: First Order Integrated Rate Law
Asked the year beforeEasyNumerical value - 5 Apr, Shift 2Q75For a reaction at T K, the half life () is plotted as a function of initial concentration of A…
Idea: Zero Order Half-Life
Asked the year beforeEasyNumerical value · figure - 6 Apr, Shift 1Q74Sucrose hydrolyses in acidic medium into glucose and fructose by first order rate law with hour. The percentage of…
Idea: Concentration After n Half-Lives
Asked the year beforeEasyNumerical value
JEE Main 20256 questions in 6 shifts
- 2 Apr, Shift 1Q72For the reaction A products. The concentration of A at 10 minutes is ___________ mol …
Idea: Zero Order Half-Life
MediumNumerical value · figure - 2 Apr, Shift 2Q71For the reaction the following graph was obtained. The time required (in seconds) for the concentration of A to reduce…
Idea: First Order Integrated Rate Law
Asked the year beforeMediumNumerical value · figure - 3 Apr, Shift 1Q58In a reaction , initial concentrations of A and B are related as…
Idea: Concentration After n Half-Lives
New ideaMediumSingle correct - 4 Apr, Shift 2Q54Half life of zero order reaction is 1 hour, when initial concentration of reactant is…
Idea: Zero Order Integrated Rate Law
Asked the year beforeEasySingle correct - 7 Apr, Shift 1Q56Reaction is a first order reaction. It was started with pure A t/min | Pressure of system at time…
Idea: Gas Kinetics with Complex Stoichiometry
Asked the year beforeMediumOther · figure - 8 Apr, Shift 2Q54In a first order decomposition reaction, the time taken for the decomposition of reactant to one fourth and one eighth of its initial…
Idea: Concentration After n Half-Lives
New ideaEasySingle correct
JEE Main 20248 questions in 8 shifts
- 6 Apr, Shift 1Q85Time required for 99.9% completion of a first order reaction is __________ times the time required for completion of 90% reaction.(nearest…
Idea: First Order Fractional Completion Shortcuts
EasyNumerical value - 8 Apr, Shift 1Q85Consider the following reaction The time taken for A to become of its initial…
Idea: First Order Fractional Completion Shortcuts
MediumNumerical value - 9 Apr, Shift 1Q86Given below are two statements : Statement I : The rate law for the reaction is rate…
Idea: Zero Order Integrated Rate Law
New ideaEasyNumerical value · figure - 1 Feb, Shift 1Q86The ratio of in a piece of wood is part that of atmosphere. If half life of…
Idea: First Order Half-Life
Asked the year beforeEasyNumerical value - 1 Feb, Shift 2Q86The following data were obtained during the first order thermal decomposition of a gas A at constant volume :…
Idea: Gas Kinetics with Complex Stoichiometry
Asked the year beforeMediumNumerical value - 30 Jan, Shift 1Q87The rate of First order reaction is 0.04 mol L s at 10 minutes and 0.03 mol L s at 20 minutes after…
Idea: First Order Integrated Rate Law
MediumNumerical value - 31 Jan, Shift 1Q65Integrated rate law equation for a first order gas phase reaction is given by (where is initial pressure and …
Idea: Gas Kinetics with Complex Stoichiometry
Asked the year beforeMediumSingle correct - 31 Jan, Shift 2Q85r = k [A] for a reaction, 50% of A is decomposed in 120 minutes. The time taken for 90% decomposition of A is _________ minutes.
Idea: First Order Fractional Life Relationships
New ideaMediumNumerical value
JEE Main 20234 questions in 4 shifts
- 10 Apr, Shift 1Q87A molecule undergoes two independent first order reactions whose respective half lives are 12 min and 3 min. If both the reactions are…
Idea: Parallel First-Order Effective Rate Constant
New ideaMediumNumerical value - 10 Apr, Shift 2Q87The number of incorrect statement/s from the following is ____________ A. The successive half lives of zero order reactions decreases with…
Idea: Zero Order Half-Life
New ideaMediumNumerical value - 13 Apr, Shift 1Q87is the time required for the reaction to undergo 87.5% completion and is the time required for the reaction to undergo…
Idea: First Order Half-Life
Asked the year beforeEasyNumerical value - 13 Apr, Shift 2Q87is a first order reaction. The initial pressure of the system was found to be 800 mm Hg which…
Idea: Gas Kinetics with Complex Stoichiometry
MediumNumerical value
JEE Main 202211 questions in 11 shifts
- 25 Jul, Shift 1Q85The half life for the decomposition of gaseous compound A is s when the gaseous pressure was Torr initially. When the pressure…
Idea: Nth-Order Half-Life Proportionality
New ideaEasyNumerical value - 25 Jul, Shift 2Q85For the decomposition of azomethane, , a first order reaction, the variation in…
Idea: First Order Half-Life
New ideaMediumNumerical value · figure - 26 Jul, Shift 1Q88For a reaction the half lives are 100 s and 50 s when the concentration of reactant A is…
Idea: Nth-Order Half-Life Proportionality
New ideaMediumNumerical value - 26 Jul, Shift 2Q64At 30°C, the half life for the decomposition of is 200 s and is independent of the initial concentration of…
Idea: First Order Integrated Rate Law
Asked the year beforeMediumSingle correct - 27 Jul, Shift 2Q85[A] [B] Reactant Product If formation of compound [B] follows the first order of kinetics and after 70 minutes the…
Idea: First Order Half-Life
New ideaEasyNumerical value - 29 Jul, Shift 2Q85Assuming 1µg of trace radioactive element X with a half life of 30 years is absorbed by a growing tree. The amount of X remaining in the…
Idea: Concentration After N Half-Lives
New ideaEasyNumerical value - 30 Jul, Shift 2Q56X decomposes at 700 K to give Y and Z. The results of two measurements are : Initial…
Idea: Nth-Order Half-Life Proportionality
New ideaMediumNumerical value - 24 Jun, Shift 2Q65For a first order reaction, the time required for completion of 90% reaction is 'x' times the half life of the reaction. The value of 'x'…
Idea: First Order Fractional Completion Shortcuts
Asked the year beforeEasySingle correct - 26 Jun, Shift 1Q84A flask is filled with equal moles of A and B. The half lives of A and B are 100 s and 50 s respectively and are independent of the…
Idea: First Order Half-Life
New ideaHardNumerical value - 28 Jun, Shift 1Q88For a first order reaction A B, the rate constant, k = . The time required for 67%…
Idea: First Order Fractional Completion Shortcuts
Asked the year beforeMediumNumerical value - 28 Jun, Shift 2Q85A radioactive element has a half life of 200 days. The percentage of original activity remaining after 83 days is __________ . (Nearest…
Idea: First Order Half-Life
New ideaMediumNumerical value
JEE Main 202110 questions in 10 shifts
- 3 Aug, Shift 2Q57The inactivation process of virus is first order with respect to virus concentration and 2% of the virus was inactivated in the first one…
Idea: First Order Integrated Rate Law
Asked the year beforeMediumNumerical value - 4 Aug, Shift 2Q59decomposes following first order kinetics according to the reaction…
Idea: Gas Kinetics with Complex Stoichiometry
New ideaHardNumerical value - 31 Aug, Shift 1 · Q56First Order Integrated Rate LawAsked the year beforeEasy
- 24 Feb, Shift 1 · Q58First Order Fractional Completion ShortcutsNew ideaMedium
- 24 Feb, Shift 2 · Q57First Order Integrated Rate LawAsked the year beforeMedium
- 22 Jul, Shift 2 · Q57First Order Integrated Rate LawAsked the year beforeEasy
- 25 Jul, Shift 1 · Q31Kinetic Graphical IdentificationNew ideaMedium
- 16 Mar, Shift 2 · Q58First Order Integrated Rate LawAsked the year beforeMedium
- 17 Mar, Shift 1 · Q58First Order Integrated Rate LawAsked the year beforeEasy
- 18 Mar, Shift 2 · Q57First Order Fractional Completion ShortcutsNew ideaEasy
JEE Main 20202 questions in 2 shifts
- 4 Sep, Shift 1 · Q48First Order Integrated Rate LawNew ideaMedium
- 5 Sep, Shift 1 · Q44First Order Integrated Rate LawNew ideaMedium
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.