NEET UG · Chemistry · Chemical Kinetics

Chemical Kinetics: NEET previous year questions

21 questions in ten years of NEET, in 10 of 10 papers. Pattern: Every year. Here is how it is asked and which ideas come back.

Asked in 10 years: 21; about 2.0 per paper
Years asked: 10/10; last asked 2026
Chance of a question next paper: 84%; historical rate, how we compute it
Weighted estimate: 2.0; model; history: 2.0 a paper on average, typically 2

Key findings

01
Asked in 10 of 10 papers, 21 questions in all: #9 of 204 topics by ten-year total.
02
74% of its questions since 2018 tested an idea never asked before; none repeated an idea from the year before.
03
The most repeated idea is First Order Integrated Rate Law, asked 4 times (2017, 2020, 2022, 2025), usually as “numerical”.
04
NEET has asked 14 of the 65 ideas in this topic; 45 have never been asked, directly or indirectly.
05
Mostly asked as numerical (48%); 62% easy, 0% hard, and up from 1.9 to 2.2 questions a paper since 2024.

Questions per year

Up to 2023: 1.9; per paper
Since 2024: 2.2; +0.3
Usual gap: 1.0 yrs; between papers asking it
Swing: ±0.3; questions, year to year

Recent framings

numerical: time from zero order rate constant
numerical: temperature from Arrhenius plot
numerical: time from first order rate constant

Revise first

Arrhenius Plot Interpretation (2021 2024 2026); First Order Integrated Rate Law (2017 2020 2022 2025); Arrhenius Equation at Two Temperatures (2024)

How it is asked

Difficulty, format and skill

Across all 21 questions on Chemical Kinetics since 2017.

Difficulty

QUESTIONS

138

Easy13 · 62%
Medium8 · 38%
Hard0 · 0%

Format

Numerical · 10 Q48%
One-line MCQ · 6 Q29%
Figure-based · 4 Q19%
Assertion–reason · 1 Q5%

Skill tested

Calculation · 10 Q48%
Concept · 5 Q24%
Data or graph · 4 Q19%
Recall · 1 Q5%
Multi-step · 1 Q5%

Repeats

New idea, or one asked before?

Each column is a paper. Blue questions tested an idea NEET had not asked before; navy ones went back to an idea from an earlier paper. 2017 is the first paper, so everything in it counts as new.

’17’18’19’20’21’22’23’24’25’26

Idea asked for the first time
Idea asked in an earlier paper

Coverage of the topic

NEET has asked 14 of the 65 ideas in this topic. 45 have never been asked yet.

14645

Asked directly14 · 22%
Touched inside another question6 · 9%
Never asked45 · 69%

Ideas come from Lumi’s syllabus map of NCERT. A never-asked idea is not a safe skip: most new questions come from exactly these.

Drill down

Idea, year, question

Every idea NEET tested in this topic, with its ten papers. Open one to read the questions.

ideaAskedShareYears’17’18’19’20’21’22’23’24’25’26

Repeated4 · 19%19%4/10
- 2025 · Q89
  If the rate constant of a reaction is 0.03 s $^{-1}$ , how much time does it take for 7.2 mol L $^{-1}$ concentration of the reactant to get…
  mediumNumerical
- 2022 · Q92
  For a first order reaction A $\to$ Products, initial concentration of A is 0.1 M, which becomes 0.001 M after 5 minutes. Rate constant for…
  easyNumerical
- 2020 · Q132
  The rate constant for a first order reaction is $4.606\times10^{-3}$ s $^{-1}$ . The time required to reduce 2.0 g of the reactant to 0.2 g…
  easyNumerical
- 2017 · Q81
  A first order reaction has a specific reaction rate of $10^{-2}$ $\mathrm{sec^{-1}}$ . How much time will it take for 20 g of the reactant…
  easyNumericalNew idea
Repeated3 · 14%14%3/10
2 · 10%10%1/102
2 · 10%10%1/102
1 · 5%5%1/10
1 · 5%5%1/10
1 · 5%5%1/10
1 · 5%5%1/10
1 · 5%5%1/10
1 · 5%5%1/10
1 · 5%5%1/10
1 · 5%5%1/10
1 · 5%5%1/10
1 · 5%5%1/10

Squares are the ten papers, 2017 to 2026; darker means more questions. Share is of the level above.

Ideas

Every idea inside this topic

14 different ideas were tested; 4 came more than once. Rate Law and Order Determination is the foundation for 52 other ideas in the syllabus.

First Order Integrated Rate Law4×
numerical
Numerical · 6% next · foundation for 25
Arrhenius Plot Interpretation3×
numerical
Figure-based · 11% next
Arrhenius Equation at Two Temperatures2×
identify data needed for a quantity
Numerical · 6% next
General Half-Life Formula2×
compare first and second order reactions
One-line MCQ · 4% next · foundation for 1
Zero Order Completion Time1×
numerical
Numerical · 6% next
First Order 99.9% Completion Shortcut1×
numerical
Numerical · 6% next
Arrhenius Equation Parameters1×
assertion-reason on activation energy
Assertion–reason · 4% next · foundation for 6
Rate Law and Order Determination1×
numerical
Numerical · 4% next · foundation for 52
Rate vs Concentration Graphs1×
graph interpretation of reaction order
Figure-based · 4% next
Reaction Coordinate Diagrams1×
graph interpretation of reaction energy profile
Figure-based · 4% next · foundation for 1
Collision Theory Parameters1×
effect of change on kinetic parameter
One-line MCQ · 4% next
First Order Percentage Completion Time Shortcuts1×
numerical
Numerical · 4% next
Rate of Appearance and Disappearance1×
relate rates of different species
One-line MCQ · 4% next
Rate Law from Fast Pre-Equilibrium Mechanisms1×
overall order from reaction mechanism
One-line MCQ · 4% next

Idea	Times	Format	Chance next	Foundation for
First Order Integrated Rate Lawnumerical	4	NumericalCalculation	6%	25 ideas
Arrhenius Plot Interpretationnumerical	3	Figure-basedData or graph	11%	–
Arrhenius Equation at Two Temperaturesidentify data needed for a quantity	2	NumericalCalculation	6%	–
General Half-Life Formulacompare first and second order reactions	2	One-line MCQConcept	4%	1 ideas
Zero Order Completion Timenumerical	1	NumericalCalculation	6%	–
First Order 99.9% Completion Shortcutnumerical	1	NumericalCalculation	6%	–
Arrhenius Equation Parametersassertion-reason on activation energy	1	Assertion–reasonConcept	4%	6 ideas
Rate Law and Order Determinationnumerical	1	NumericalCalculation	4%	52 ideas
Rate vs Concentration Graphsgraph interpretation of reaction order	1	Figure-basedData or graph	4%	–
Reaction Coordinate Diagramsgraph interpretation of reaction energy profile	1	Figure-basedData or graph	4%	1 ideas
Collision Theory Parameterseffect of change on kinetic parameter	1	One-line MCQConcept	4%	–
First Order Percentage Completion Time Shortcutsnumerical	1	NumericalCalculation	4%	–
Rate of Appearance and Disappearancerelate rates of different species	1	One-line MCQConcept	4%	–
Rate Law from Fast Pre-Equilibrium Mechanismsoverall order from reaction mechanism	1	One-line MCQMulti-step	4%	–

Chance next is the historical rate at which an idea with this record came back in the following paper. It is low for every idea, which is why learning the topic beats memorising past questions. All repeated ideas

Every question

Chemical Kinetics questions, year by year

The opening words of each question as it appeared in the official paper, with the idea it tested.

NEET 20262 questions

Q60
$\mathrm{2A\xrightarrow{k}B}$ is a zero-order reaction, where k = 1.0 mol L $^{-1}$ min $^{-1}$ . If the initial concentration of A is 2 M,…
Idea: Zero Order Completion Time
New ideaMediumNumerical
Q64
For an elementary chemical reaction, the Arrhenius plot is given below. If the energy of activation is 6.64 kJ mol $^{-1}$ and R = 8.3 J…
Idea: Arrhenius Plot Interpretation
MediumFigure-based · figure

NEET 20252 questions

Q56
If the half-life ( $t_{1/2}$ ) for a first order reaction is 1 minute, then the time required for 99.9% completion of the reaction is…
Idea: First Order 99.9% Completion Shortcut
New ideaEasyNumerical
Q89
If the rate constant of a reaction is 0.03 s $^{-1}$ , how much time does it take for 7.2 mol L $^{-1}$ concentration of the reactant to get…
Idea: First Order Integrated Rate Law
MediumNumerical

NEET 20243 questions

Q55
Which plot of ln k vs $\frac{1}{T}$ is consistent with Arrhenius equation?
Idea: Arrhenius Plot Interpretation
EasyFigure-based · figure
Q70
Activation energy of any chemical reaction can be calculated if one knows the value of
Idea: Arrhenius Equation at Two Temperatures
New ideaEasyOne-line MCQ
Q88
The rate of a reaction quadruples when temperature changes from 27°C to 57°C. Calculate the energy of activation. Given R = 8.314 J…
Idea: Arrhenius Equation at Two Temperatures
New ideaMediumNumerical

NEET 20232 questions

Q55
Given below are two statements : one is labelled as Assertion A and the other is labelled as Reason R : Assertion A : A reaction can have…
Idea: Arrhenius Equation Parameters
New ideaMediumAssertion–reason
Q65
For a certain reaction, the rate = k[A] $^2$ [B], when the initial concentration of A is tripled keeping concentration of B constant, the…
Idea: Rate Law and Order Determination
New ideaEasyNumerical

NEET 20222 questions

Q85
The given graph is a representation of kinetics of a reaction. The y and x axes for zero and first order reactions, respectively are
Idea: Rate vs Concentration Graphs
New ideaMediumFigure-based · figure
Q92
For a first order reaction A $\to$ Products, initial concentration of A is 0.1 M, which becomes 0.001 M after 5 minutes. Rate constant for…
Idea: First Order Integrated Rate Law
EasyNumerical

NEET 20212 questions

Q77
For a reaction A $\to$ B, enthalpy of reaction is −4.2 kJ $\mathrm{mol^{-1}}$ and enthalpy of activation is 9.6 kJ $\mathrm{mol^{-1}}$ . The…
Idea: Reaction Coordinate Diagrams
New ideaMediumFigure-based · figure
Q98
The slope of Arrhenius Plot $\left(\ln k \text{ v/s } \frac{1}{T}\right)$ of first order reaction is $-5\times10^{3}$ K. The value of…
Idea: Arrhenius Plot Interpretation
New ideaEasyNumerical

NEET 20202 questions

Q109
An increase in the concentration of the reactants of a reaction leads to change in :
Idea: Collision Theory Parameters
New ideaEasyOne-line MCQ
Q132
The rate constant for a first order reaction is $4.606\times10^{-3}$ s $^{-1}$ . The time required to reduce 2.0 g of the reactant to 0.2 g…
Idea: First Order Integrated Rate Law
EasyNumerical

NEET 20192 questions

Q63
If the rate constant for a first order reaction is k, the time (t) required for the completion of 99% of the reaction is given by :
Idea: First Order Percentage Completion Time Shortcuts
New ideaEasyNumerical
Q67
For the chemical reaction $N_2(g) + 3H_2(g) \rightleftharpoons 2NH_3(g)$ the correct option is :
Idea: Rate of Appearance and Disappearance
New ideaEasyOne-line MCQ

NEET 20182 questions

Q79
The correct difference between first- and second-order reactions is that
Idea: General Half-Life Formula
New ideaEasyOne-line MCQ
Q84
When initial concentration of the reactant is doubled, the half-life period of a zero order reaction
Idea: General Half-Life Formula
New ideaEasyOne-line MCQ

NEET 20172 questions

Q81
A first order reaction has a specific reaction rate of $10^{-2}$ $\mathrm{sec^{-1}}$ . How much time will it take for 20 g of the reactant…
Idea: First Order Integrated Rate Law
EasyNumerical
Q88
Mechanism of a hypothetical reaction $\mathrm{X_2 + Y_2 \to 2XY}$ is given below (i) $\mathrm{X_2 \to X + X}$ (fast) (ii)…
Idea: Rate Law from Fast Pre-Equilibrium Mechanisms
MediumOne-line MCQ

Questions from the official NEET UG papers published by NTA (CBSE before 2019). Topic and idea tags, counts and notes are Lumi’s.