Chemical Kinetics JEE Main PYQs PDF, 2020–2026

Chemical Kinetics questions per year

in the free PDF asked, not in the PDFThe PDF only has questions we can print in full with a checked answer, so it holds 147 of the 151 asked.

Topic-wise weightage by year

How many Chemical Kinetics questions each topic had in every JEE Main year (all shifts), counting every question asked, including ones not in the PDF. Darker cells mean more questions.

Swipe the table sideways for older years.

Newest questions (2026)

The 12 newest of the 27 JEE Main 2026 Chemical Kinetics questions in the free PDF, latest shift first.

1. JEE Main 2026 · 8 Apr · Shift 2 · Arrhenius Equation

   Given below are two statements :

   ${\mathrm{R}}=8.314{\ \mathrm{J}}{\ \mathrm{K}}^{{-1}}{\ \mathrm{mol}}^{{-1}}\text{ and}1{\mathrm{cal}}=4.2{\ \mathrm{J}}$

   Statement I : When ${\mathrm{Ea}}=12.6{\mathrm{kcal}}/{\mathrm{mol}}$, the room temperature rate constant is doubled by a ${10}^{{\circ}}{\mathrm{C}}$ increase in temperature ( 298 K to 308 K )

   Statement II : For a first order reactions ${\mathrm{A}}\rightarrow {\mathrm{B}}$,

   

   Here $[A]_{0}$ is the initial concentration of $A$ and $t_{{1/2}}$ is half life of reaction.

   In the light of the above statements, choose the correct answer from the options given below :

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2. JEE Main 2026 · 6 Apr · Shift 2 · Arrhenius Equation

   Decomposition of a hydrocarbon follows the equation ${\mathrm{k}}=\left(5.5\times {10}^{{11}}{\ \mathrm{s}}^{{-1}}\right){\mathrm{e}}^{{\frac{-28000{\ \mathrm{K}}}{{\ \mathrm{T}}}}}$. The activation energy of reaction is $\_\_\_\_$ ${\mathrm{kJ}}{\mathrm{mol}}^{{-1}}$. (Nearest Integer)

   Given : ${\mathrm{R}}=8.3{\ \mathrm{J}}{\ \mathrm{K}}^{{-1}}{\ \mathrm{mol}}^{{-1}}$

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3. JEE Main 2026 · 6 Apr · Shift 1 · Half-Life

   Sucrose hydrolyses in acidic medium into glucose and fructose by first order rate law with $t_{{1/2}}=3$ hour. The percentage of sucrose remaining after 6 hours is

   $\_\_\_\_$ . (Nearest integer)

   (Given $:\log 2=0.3010$ and $\log 3=0.4771$ )

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4. JEE Main 2026 · 5 Apr · Shift 1 · Rate Law and Order

   If 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 $\_\_\_\_$ minutes.

   (Given $:\log 2=0.3010$ )

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5. JEE Main 2026 · 5 Apr · Shift 2 · Zero and First Order Reactions

   For a reaction ${\mathrm{A}}\rightarrow {\mathrm{P}}$ at T K , the half life $\left({\mathrm{t}}_{{1/2}}\right)$ is plotted as a function of initial concentration $[{\mathrm{A}}]_{0}$ of A as given below.

   

   The value of $x$ in the given figure is $\_\_\_\_$ s (Nearest integer)

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6. JEE Main 2026 · 5 Apr · Shift 1 · Rate Law and Order

   First order gas phase reaction

   ${\mathrm{A}}\rightarrow {\ \mathrm{B}}+{\mathrm{C}}$

   $p_{t}=$ initial pressure of gas ${\mathrm{A}},p_{t}=$ total pressure of the reaction mixture at time $t$

   Expression of rate constant ( $k$ ) is

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7. JEE Main 2026 · 4 Apr · Shift 2 · Rate Law and Order

   $\text{ For a first order reaction}{\mathrm{A}}\rightarrow {\ \mathrm{B}}$

   $\begin{array}{cc}{\mathrm{t}}/min & {[{\mathrm{A}}]/{\mathrm{M}}} \\ 0 & 0.6500 \\ x & 0.0650 \\ 20 & 0.00065\end{array}$

   $x=$ $\_\_\_\_$ min. (Nearest integer)

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8. JEE Main 2026 · 4 Apr · Shift 2 · Rate Law and Order

   Consider the given graph showing variation of reactant concentration with time.

   Three different reactions were started with identical initial concentration of reactants. Which of the following statement is correct?

   
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9. JEE Main 2026 · 4 Apr · Shift 1 · Rate Law and Order

   Consider the first order reaction ${\mathrm{R}}\rightarrow {\mathrm{P}}$.

   The fraction of molecules decomposed in the given first order reaction can be expressed as

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10. JEE Main 2026 · 2 Apr · Shift 2 · Rate Law and Order

    Consider the following gas phase reaction being carried out in a closed vessel at ${25}^{\circ}$C.

    $2A(g)\longrightarrow 4B(g)+C(g)$

    time (min)	total pressure of the system (mm Hg)
    30	300
    ∞	600

    The pressure of C(g) at 30 minutes time interval would be ________ mm Hg. (nearest integer)

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11. JEE Main 2026 · 2 Apr · Shift 2 · Rate Law and Order

    Consider the reaction aX → bY, for which the rate constant at 30°C is $1\times {10}^{{-3}}\ \text{mol}^{{-1}}\ \text{L}\ \text{s}^{{-1}}$. Which of the following statements are true?

    A. When concentration of ‘X’ is increased to four times, the rate of reaction becomes 16 times.

    B. The reaction is a second order reaction.

    C. The half-life period is independent of the concentration of X.

    D. Decomposition of N${}_{2}$O${}_{5}$ is an example of the above reaction.

    E. vs time is valid for the above reaction.

    Choose the correct answer from the options given below:

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12. JEE Main 2026 · 2 Apr · Shift 1 · Rate Law and Order

    t_100% is the time required for the 100% completion of the reaction while t_1/2 is the time required for 50% of the reaction to be completed. Which of the following option correctly represents the relation between t_100% and t_1/2 for zero and first order reactions respectively?

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Practise the 2026 Chemical Kinetics questions online

Sample questions from recent papers

JEE Main 2026 · 2 Apr · Shift 1 · Arrhenius Equation

For reaction A → P, rate constant $k=1.5\times {10}^{3}\ {\mathrm{s}}^{{-1}}$ at ${27}^{{\circ}}{\mathrm{C}}$

If activation energy for the above reaction is $60\ {\mathrm{kJ}}\ {\mathrm{mol}}^{{-1}}$, then the temperature (in ${}^{{\circ}}{\mathrm{C}}$) at which rate constant, $k=4.5\times {10}^{3}\ {\mathrm{s}}^{{-1}}$ is ______. (Nearest integer)

Given : $\log 2=0.30$, $\log 3=0.48$, $R=8.3\ {\mathrm{J}}\ {\mathrm{K}}^{{-1}}\ {\mathrm{mol}}^{{-1}}$, $\ln 10=2.3$

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Answer: 41

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JEE Main 2026 · 24 Jan · Shift 1 · Rate of Reaction

${\mathrm{A}}\rightarrow {\mathrm{D}}$ is an endothermic reaction occurring in three steps (elementary).

(i) ${\mathrm{A}}\rightarrow {\mathrm{B}}\Delta{\mathrm{H}}_{i}=+{\mathrm{ve}}$

(ii) ${\mathrm{B}}\rightarrow {\mathrm{C}}\Delta{\mathrm{H}}_{{ii}}=-{\mathrm{ve}}$

(iii) ${\mathrm{C}}\rightarrow {\mathrm{D}}\Delta{\mathrm{H}}_{{iii}}=-{\mathrm{ve}}$

Which of the following graphs between potential energy ( $y$-axis) vs reaction coordinate ( $x$-axis) correctly represents the reaction profile of $A\rightarrow D$ ?

1. (A)
2. (B)
3. (C)
4. (D)

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Answer: (D)

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JEE Main 2026 · 23 Jan · Shift 2 · Zero and First Order Reactions

Given above is the concentration vs time plot for a dissociation reaction : ${\mathrm{A}}\rightarrow {\mathrm{nB}}$.

Based on the data of the initial phase of the reaction (initial 10 min ), the value of n is $\_\_\_\_$ .

1. (A)

   2

2. (B)

   5

3. (C)

   4

4. (D)

   3

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Answer: (D)

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JEE Main 2025 · 8 Apr · Shift 2 · Half-Life

In a first order decomposition reaction, the time taken for the decomposition of reactant to one fourth and one eighth of its initial concentration are $t_1$ and $t_2$ (s), respectively. The ratio $t_1/t_2$ will be:

1. (A)

   $\frac{4}{3}$

2. (B)

   $\frac{3}{2}$

3. (C)

   $\frac{3}{4}$

4. (D)

   $\frac{2}{3}$

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Answer: (D)

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JEE Main 2025 · 4 Apr · Shift 1 · Mechanisms and Catalysis

For $\mathrm{A}_2+\mathrm{B}_2 \rightleftharpoons 2 \mathrm{AB}$

$\mathrm{E}_{\mathrm{a}}$ for forward and backward reaction are 180 and $200 \mathrm{~kJ} \mathrm{~mol}^{-1}$ respectively

If catalyst lowers $\mathrm{E}_{\mathrm{a}}$ for both reaction by $100 \mathrm{~kJ} \mathrm{~mol}^{-1}$.

Which of the following statement is correct?

1. (A)Catalyst does not alter the Gibbs energy change of a reaction.
2. (B) The enthalpy change for the reaction is $+20 \mathrm{~kJ} \mathrm{~mol}^{-1}$.
3. (C) Catalyst can cause non-spontaneous reactions to occur.
4. (D)The enthalpy change for the catalysed reaction is different from that of uncatalysed reaction.

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Answer: (A)

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The free PDF above has all 147 questions grouped by topic, with an answer key.

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