JEE Main · Chemistry · Chemical Kinetics
Arrhenius Equation: JEE Main previous year questions
35 questions in the 108 JEE Main shifts Lumi analysed, in 8 of 8 years. Pattern: Asked most years. 8 came in 2024–26. Here is how it is asked and which ideas come back.
- Questions
- 35
- in 35 of 108 shifts
- Years asked
- 8/8
- last asked 2026
- Weighted estimate
- 0.3
- model; history: 0.4 a shift on average, typically 0.2–0.5
Key findings
- 01
Asked in 8 of 8 years with analysed shifts and in 35 of 108 shifts: 35 questions, #98 of 196 topics. It came in every year with analysed shifts.
- 02
35% of its questions since 2020 tested an idea no earlier year had asked; 13 repeated an idea from the year before.
- 03
The most repeated idea is Two-Point Arrhenius Equation, asked 7 times in 7 shifts (2020, 2021, 2022, 2026), most often as “temperature from rate constants and ea”.
- 04
JEE Main has asked 10 of the 56 ideas in this topic; 39 have never been asked, directly or inside another question.
- 05
Mostly asked as numerical value (71%); 71% need a numerical answer, 29% are easy and 3% hard.
- 06
The skill tested most is calculation (63%), then data or graph (20%).
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: 1 in 1 shift · 2020: 6 in 12 shifts · 2021: 7 in 24 shifts · 2022: 8 in 24 shifts · 2023: 5 in 12 shifts · 2024: 2 in 18 shifts · 2025: 3 in 8 shifts · 2026: 3 in 9 shifts.
- Up to 2023
- 0.4
- a shift, of 25
- Since 2024
- 0.3
- -0.2
- Usual gap
- 1.3 yrs
- between years asking it
- Shifts with it
- 35/108
- 32% of analysed shifts
How it is asked
Difficulty, format and skill
Across all 35 questions on Arrhenius Equation since 2017.
Difficulty
QUESTIONS- Easy10 · 29%
- Medium24 · 69%
- Hard1 · 3%
Format
SHARE- Numerical value · 25 Q71%
- Diagram based · 5 Q14%
- Single correct · 3 Q9%
- Two statements · 1 Q3%
- Other · 1 Q3%
Skill tested
SHARE- Calculation · 22 Q63%
- Data or graph · 7 Q20%
- Multi-step · 2 Q6%
- Diagram reading · 2 Q6%
- Conceptual · 2 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 10 of the 56 ideas in this topic. 39 have never been asked yet.
- Asked directly10 · 18%
- Touched inside another question7 · 13%
- Never asked39 · 70%
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.
10 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
10 different ideas were tested; 7 came more than once.
temperature from rate constants and ea
Numerical value · 7 shifts · 6 numericalrate ratio from activation energies
Numerical value · 7 shifts · 7 numericalactivation energy from rate expression
Numerical value · 4 shifts · 3 numericalgraph interpretation of arrhenius plot
Diagram based · 4 shifts · 2 numericalgraph interpretation of reaction energy profile
Diagram based · 4 shifts · 1 numericalchange in activation energy from rate ratio
Numerical value · 4 shifts · 2 numericaloverall ea from composite rate constant
Numerical value · 2 shifts · 2 numericalcount correct statements on arrhenius equation
Other · 1 shiftactivation energy of reverse reaction
Numerical value · 1 shift · 1 numericalactivation energy from change in active fraction
Numerical value · 1 shift · 1 numerical
| Idea | Years asked | Times | Shifts | Format | Numerical |
|---|---|---|---|---|---|
| Two-Point Arrhenius Equationtemperature from rate constants and ea | 7 | 7 | Numerical valueCalculation | 6 | |
| Activation Energy Calculationrate ratio from activation energies | 7 | 7 | Numerical valueCalculation | 7 | |
| Arrhenius Exponential Formactivation energy from rate expression | 4 | 4 | Numerical valueCalculation | 3 | |
| Log Base 10 Arrhenius Plot Slopegraph interpretation of arrhenius plot | 4 | 4 | Diagram basedData or graph | 2 | |
| Reaction Energy Profilesgraph interpretation of reaction energy profile | 4 | 4 | Diagram basedData or graph | 1 | |
| Catalyst Effect on Arrhenius Parameterschange in activation energy from rate ratio | 4 | 4 | Numerical valueCalculation | 2 | |
| Effective Activation Energy for Complex Reactionsoverall ea from composite rate constant | 2 | 2 | Numerical valueCalculation | 2 | |
| Temperature Sensitivity vs Activation Energycount correct statements on arrhenius equation | 1 | 1 | OtherConceptual | – | |
| Forward and Backward Activation Energy Relationshipactivation energy of reverse reaction | 1 | 1 | Numerical valueCalculation | 1 | |
| Boltzmann Factor as Active Fractionactivation energy from change in active fraction | 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
Arrhenius Equation 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 20263 questions in 3 shifts
- 2 Apr, Shift 1Q74For reaction , rate constant at C If activation energy for the above…
Idea: Two-Point Arrhenius Equation
MediumNumerical value - 6 Apr, Shift 2Q75Decomposition of a hydrocarbon follows the equation . The…
Idea: Arrhenius Exponential Form
EasyNumerical value - 8 Apr, Shift 2Q57Given below are two statements : and 1 cal = 4.2 J Statement I : When Ea = 12.6 kcal/mol, the…
Idea: Two-Point Arrhenius Equation
MediumTwo statements · figure
JEE Main 20253 questions in 3 shifts
- 2 Apr, Shift 2Q56Reactant A converts to product D through the given mechanism (with the net evolution of heat) : slow; ve…
Idea: Reaction Energy Profiles
MediumDiagram based · figure - 3 Apr, Shift 2Q57Consider the following statements related to temperature dependence of rate constants. Identify the correct statements. A. The Arrhenius…
Idea: Temperature Sensitivity vs Activation Energy
New ideaMediumOther - 4 Apr, Shift 2Q55Consider the following plots of log of rate constant k (log k) vs for three different reactions. The correct order of…
Idea: Log Base 10 Arrhenius Plot Slope
EasyDiagram based · figure
JEE Main 20242 questions in 2 shifts
- 4 Apr, Shift 1Q85Consider the following transformation involving first order elementary reaction in each step at constant temperature as shown below.…
Idea: Effective Activation Energy for Complex Reactions
New ideaMediumNumerical value - 29 Jan, Shift 1Q87For a reaction taking place in three steps at same temperature, overall rate constant . If , and …
Idea: Effective Activation Energy for Complex Reactions
New ideaMediumNumerical value
JEE Main 20235 questions in 5 shifts
- 6 Apr, Shift 1Q87For the adsorption of hydrogen on platinum, the activation energy is 30 kJ mol and for the adsorption of hydrogen on nickel, the…
Idea: Activation Energy Calculation
Asked the year beforeMediumNumerical value - 6 Apr, Shift 2Q63Consider the following reaction that goes from A to B in three steps as shown below: Choose the correct option Number of intermediates |…
Idea: Reaction Energy Profiles
MediumDiagram based · figure - 8 Apr, Shift 1Q87The number of given statement/s which is/are correct is ________ (A) The stronger the temperature dependence of the rate constant, the…
Idea: Activation Energy Calculation
Asked the year beforeMediumNumerical value - 8 Apr, Shift 2Q63The correct reaction profile diagram for a positive catalyst reaction.
Idea: Reaction Energy Profiles
EasyDiagram based · figure - 15 Apr, Shift 1Q85For a reversible reaction , the kJ . The…
Idea: Catalyst Effect on Arrhenius Parameters
Asked the year beforeHardNumerical value
JEE Main 20228 questions in 8 shifts
- 28 Jul, Shift 2Q58For a reaction, given below is the graph of ln k vs . The activation energy for the reaction is equal to ______ cal…
Idea: Log Base 10 Arrhenius Plot Slope
Asked the year beforeEasyNumerical value · figure - 24 Jun, Shift 1Q85The rate constants for decomposition of acetaldehyde have been measured over the temperature range K. The data has been…
Idea: Activation Energy Calculation
Asked the year beforeEasyNumerical value · figure - 26 Jun, Shift 2Q88Catalyst A reduces the activation energy for a reaction by 10 kJ at 300 K. The ratio of rate constants,…
Idea: Catalyst Effect on Arrhenius Parameters
MediumNumerical value - 27 Jun, Shift 1Q86The rate constant for a first order reaction is given by the following equation : …
Idea: Activation Energy Calculation
Asked the year beforeEasyNumerical value - 27 Jun, Shift 2Q88It has been found that for a chemical reaction with rise in temperature by 9 K the rate constant gets doubled. Assuming a reaction to be…
Idea: Activation Energy Calculation
Asked the year beforeMediumNumerical value - 29 Jun, Shift 1Q85The activation energy of one of the reactions in a biochemical process is . When the temperature falls from…
Idea: Two-Point Arrhenius Equation
Asked the year beforeMediumNumerical value - 29 Jun, Shift 2Q85The equation is followed for the decomposition of compound A. The…
Idea: Activation Energy Calculation
Asked the year beforeEasyNumerical value - 30 Jun, Shift 1Q84For the reaction P B, the values of frequency factor A and activation energy are s…
Idea: Arrhenius Exponential Form
Asked the year beforeMediumNumerical value
JEE Main 20217 questions in 7 shifts
- 27 Aug, Shift 2Q59The first order rate constant for the decomposition of at 700 K is and…
Idea: Two-Point Arrhenius Equation
Asked the year beforeMediumNumerical value - 31 Aug, Shift 1Q53According to the following figure, the magnitude of the enthalpy change of the reaction in kJ mol is…
Idea: Reaction Energy Profiles
New ideaMediumNumerical value · figure - 31 Aug, Shift 2Q57For the reaction A → B, the rate constant k (in ) is given by The…
Idea: Activation Energy Calculation
New ideaEasyNumerical value - 25 Feb, Shift 1Q56For the reaction, , the plot of vs is…
Idea: Log Base 10 Arrhenius Plot Slope
Asked the year beforeMediumNumerical value · figure - 25 Feb, Shift 2Q57The rate constant of a reaction increases by five times on increase in temperature from 27C to 52C. The value of…
Idea: Two-Point Arrhenius Equation
Asked the year beforeMediumNumerical value - 26 Feb, Shift 1Q57An exothermic reaction has an activation energy 30 kJ mol. If energy change during the…
Idea: Forward and Backward Activation Energy Relationship
New ideaEasyNumerical value - 26 Feb, Shift 2Q58If the activation energy of a reaction is 80.9 kJ , the fraction of molecules at 700 K, having enough energy to react…
Idea: Arrhenius Exponential Form
MediumNumerical value
JEE Main 20206 questions in 6 shifts
- 8 Jan, Shift 1Q27The rate of a certain biochemical reaction at physiological temperature (T) occurs times faster with enzyme than without. The…
Idea: Catalyst Effect on Arrhenius Parameters
New ideaMediumSingle correct - 8 Jan, Shift 2Q27Consider the following plots of rate constant versus for four different reactions. Which of the following orders is correct…
Idea: Log Base 10 Arrhenius Plot Slope
New ideaMediumDiagram based · figure - 9 Jan, Shift 1Q29For following reactions it was found that…
Idea: Catalyst Effect on Arrhenius Parameters
New ideaMediumSingle correct - 9 Jan, Shift 2Q48A sample of milk splits after 60 min. at 300 K and after 40 min. at 400 K when the population of lactobacillus acidophilus in it doubles.…
Idea: Two-Point Arrhenius Equation
New ideaMediumNumerical value - 4 Sep, Shift 2Q48The number of molecules with energy greater than the threshold energy for a reaction increases five fold by a rise of temperature from 27…
Idea: Boltzmann Factor as Active Fraction
New ideaMediumNumerical value - 6 Sep, Shift 2Q48The rate of a reaction decreased by 3.555 times when the temperature was changed from 40 °C to 30 °C. The activation energy (in kJ…
Idea: Two-Point Arrhenius Equation
New ideaMediumNumerical value
JEE Main 20171 question in 1 shift
- 2 Apr (offline)Q39Two reactions and have identical pre-exponential factors. Activation energy of exceeds that of by 10 kJ…
Idea: Arrhenius Exponential Form
EasySingle correct
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.