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Chemical Kinetics — JEE Main & Advanced Chemistry PYQs

491 previous year questions from Chemical Kinetics with answers and solutions. Numbered list, year tags, and one-tap solutions — built for serious JEE / NEET practice.

491 questionsChemistrySolutions on every page
1

For a reversible reaction R P , at constant temperature, both the forward and the backward reactions are first order elementary reactions with rate constants k_f and k_b , respecti

JEE Advanced 2026 Solution View → 2

For a first-order reaction R P at a given temperature, k is the rate constant. For this reaction, at the given temperature, the concentrations of R and P at a time t are [ R ] and

JEE Advanced 2026 Solution View → 3

Given below are two statements: R=8.314 J K ⁻¹ mol ⁻¹ and 1 cal =4.2 J Statement I: When E_a=12.6 kcal/mol, the room temperature rate constant is doubled by a 10 ,^ C increase in t

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Decomposition of a hydrocarbon follows the equation k = (5.5 10¹¹ , s ⁻¹) ,e^ -28000 , K T . The activation energy of reaction is __________ kJ mol ⁻¹ . (Nearest Integer) Given : R

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For a reaction A P at T K , the half life (t_ 1/2 ) is plotted as a function of initial concentration [A]₀ of A as given below. The value of x in the given figure is _______ s (Nea

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First order gas phase reaction A B + C p_i = initial pressure of gas A, p_t = total pressure of the reaction mixture at time t Expression of rate constant ( k ) is

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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 : 2 = 0.3010 )

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Consider the given graph showing variation of reactant concentration with time. Three different reactions were started with identical initial concentration of reactants. Which of t

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For a first order reaction A B t/ min [A]/M 0 0.6500 x 0.0650 20 0.00065 x= ______ min. (Nearest integer)

JEE Main 2026 Solution View → 10

Consider the first order reaction R P . The fraction of molecules decomposed in the given first order reaction can be expressed as

JEE Main 2026 Solution View → 11

Consider the reaction aX bY , for which the rate constant at 30°C is 1 10⁻³ mol ⁻¹ L s ⁻¹ . Which of the following statements are true? A. When concentration of 'X' is increased to

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Consider the following gas phase reaction being carried out in a closed vessel at 25°C . 2A(g) 4B(g) + C(g) time (min) total pressure of the system (mm Hg) 30 300 600 The pressure

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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 cor

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For reaction A P , rate constant k = 1.5 10^3 s ⁻¹ at 27° C. If activation energy for the above reaction is 60 kJ mol ⁻¹ , then the temperature (in ° C) at which rate constant, k =

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A B (first reaction) C D (second reaction) Consider the above two first-order reactions. The rate constant for first reaction at 500 K is double of the same at 300 K. At 500 ~K , 5

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An organic compound undergoes first order decomposition. The time taken for decomposition to ( 1 8 )^ th and ( 1 10 )^ th of its initial concentration are t _ 1 / 8 and t _ 1 / 10

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The half-life of ⁶⁵ Zn is 245 days. After x days, 75 % of original activity remained. The value of x in days is _ _ _ _ . (Nearest integer) (Given: 3=0.4771 and 2=0.3010 )

JEE Main 2026 Solution View → 18

At 27^ C in presence of a catalyst, activation energy of a reaction is lowered by 10 ~kJ ~mol ⁻¹ . The logarithm of ratio of k (catalysed) k (uncatalysed) is.... (Consider that the

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Given above is the concentration vs time plot for a dissociation reaction : A nB . Based on the data of the initial phase of the reaction (initial 10 min), the value of n is _ _ _

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Observe the following reactions at T ( K ) . I. A products. II. 5 Br ⁻( aq )+ BrO ₃ ⁻( aq )+6 H ⁺( aq ) 3 Br ₂( aq )+3 H ₂ O ( l ) Both the reactions are started at 10.00 am. The r

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For the thermal decomposition of reactant AB ( g ) , the following plot is constructed. The half life of the reaction is ' x^ . x= _ _ _ _ min. (Nearest integer)

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Correct statements regarding Arrhenius equation among the following are : A. Factor e^ -E a / R T corresponds to fraction of molecules having kinetic energy less than Ea. B. At a g

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Consider A k ₁ ~B and C k ₂ D are two reactions. If the rate constant ( k ₁ ) of the A B reaction can be expressed by the following equation ₁₀ k =14.34- 1.5 10⁴ ~T / K and activat

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A product (First order reaction). Three sets of experiment were performed for a reaction under similar experimental conditions: Run 1 100 ~mL of 10 M solution of reactant A Run 2 2

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The temperature at which the rate constants of the given below two gaseous reactions become equal is _ _ _ _ K. (Nearest integer) X Y k ₁=10⁶ e^ -30000 ~T P Q k ₂=10⁴ e^ -24000 ~T

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Decomposition of A is a first order reaction at T ( K ) and is given by A ( g ) B ( g )+ C ( g ) . In a closed 1 L vessel, 1 bar A ( g ) is allowed to decompose at T ( K ) . After

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Pre-exponential factors of two different reactions of same order are identical. Let activation energy of first reaction exceeds the activation energy of second reaction by 20 ~kJ ~

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Consider a reaction A+R Product. The rate of this reaction is measured to be k[A][R] . At the start of the reaction, the concentration of R,[R]₀ , is 10 -times the concentration of

JEE Advanced 2025 Solution View → 29

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 t₁ and t₂(s) , respectively.

JEE Main 2025 Solution View → 30

A ( g ) B ( g )+ C ( g ) is a first order reaction. array |l|l|l| Time & T & P _ system & P _ t & P _ array The reaction was started with reactant A only. Which of the following ex

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Reaction A ( g ) 2 ~B ( ~g )+ C ( g ) is a first order reaction. It was started with pure A Which of the following option is incorrect ?

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A person's wound was exposed to some bacteria and then bacteria growth started to happen at the same place. The wound was later treated with some antibacterial medicine and the rat

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Half life of zero order reaction A product is 1 hour, when initial concentration of reaction is 2.0 ~mol ~L ~L ⁻¹ . The time required to decrease concentration of A from 0.50 to 0.

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Consider the following plots of log of rate constant k ( k ) vs 1 ~T for three different reactions. The correct order of activation energies of these reactions is

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Rate law for a reaction between A and B is given by R = k [ ~A ]^ n [ ~B ]^ m If concentration of A is doubled and concentration of B is halved from their initial value, the ratio

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For A ₂+ B ₂ 2 AB E _ a for forward and backward reaction are 180 and 200 ~kJ ~mol ⁻¹ respectively If catalyst lowers E _ a for both reaction by 100 ~kJ ~mol ⁻¹ . Which of the foll

JEE Main 2025 Solution View → 37

Consider the following statements related to temperature dependence of rate constants. Identify the correct statements, A. The Arrhenius equation holds true only for an elementary

JEE Main 2025 Solution View → 38

In a reaction A+B C , initial concentrations of A and B are related as [A]₀=8[B]₀ . The half lives of A and B are 10 min and 40 min. respectively. If they start to disappear at the

JEE Main 2025 Solution View → 39

For the reaction A B the following graph was obtained. The time required (in seconds) for the concentration of A to reduce to 2.5 ~g ~L ⁻¹ (if the initial concentration of A was 50

JEE Main 2025 Solution View → 40

Reactant A converts to product D through the given mechanism (with the net evolution of heat) : A B slow ; H =+ ve B C fast; H =- ve C D fast ; H =- ve Which of the following repre

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For the reaction ( A ) products. The concentration of A at 10 minutes is _______ ( 10⁻³ ~mol ~L ⁻¹ ) (nearest integer). The reaction was started with (2.5 ~mol ~L ⁻¹ ) of A.

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Drug X becomes ineffective after 50 % decomposition. The original concentration of drug in a bottle was 16 mg / mL which becomes 4 mg / mL in 12 months. The expiry time of the drug

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The reaction ( A ₂+ B ₂ 2 AB ) follows the mechanism The overall order of the reaction is :

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For bacterial growth in a cell culture, growth law is very similar to the law of radioactive decay. Which of the following graphs is most suitable to represent bacterial colony gro

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Consider an elementary reaction A ( g )+ B ( g ) C ( g )+ D ( g ) If the volume of reaction mixture is suddenly reduced to 1 3 of its initial volume, the reaction rate will become

JEE Main 2025 Solution View → 46

For a given reaction R P , t _ 1 / 2 is related to [ A ]₀ as given in table. Given: 2=0.30 Which of the following is true? A. The order of the reaction is 1 / 2 . B. If [ A ]₀ is 1

JEE Main 2025 Solution View → 47

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

JEE Main 2025 Solution View → 48

Consider a complex reaction taking place in three steps with rate constants k₁, k₂ and k₃ respectively. The overall rate constant k is given by the expression k= k₁ k₃ k₂ . If the

JEE Main 2025 Solution View → 49

Which of the following graphs most appropriately represents a zero order reaction ?

JEE Main 2025 Solution View → 50

For the thermal decomposition of N ₂ O ₅( ~g ) at constant volume, the following table can be formed, for the reaction mentioned below. 2 ~N ₂ O ₅( ~g ) 2 ~N ₂ O ₄( ~g )+ O ₂( ~g )

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Consider the given figure and choose the correct option :

JEE Main 2025 Solution View → 52

Which of the following statement is not true for radioactive decay?

JEE Main 2025 Solution View → 53

A ~B The molecule A changes into its isomeric form B by following a first order kinetics at a temperature of 1000 K . If the energy barrier with respect to reactant energy for such

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A sample initially contains only U-238 isotope of uranium. With time, some of the U-238 radioactively decays into Pb -206 while the rest of it remains undisintegrated. When the age

JEE Advanced 2024 Solution View → 55

Consider the following reaction, 2 H ₂( ~g )+2 NO ( g ) N ₂( ~g )+2 H ₂ O ( g ) which follows the mechanism given below: 2 NO ( g ) k₁ k_ -1 N ₂ O ₂( ~g ) (fast equlibrium) N ₂ O ₂

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Consider the following first order gas phase reaction at constant temperature ( A ( g ) 2 ~B ( ~g )+ C ( g ) ) If the total pressure of the gases is found to be 200 torr after (23

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Given below are two statements : Statement I: The rate law for the reaction (A+B C ) is rate ((r)=k[A]^2[B] ). When the concentration of both A and B is doubled, the reaction rate

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For a reaction ( A K ₁ ~B K ₂ C ) If the rate of formation of (B ) is set to be zero then the concentration of (B ) is given by :

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Consider the following reaction [ A + B C ] The time taken for ( A ) to become (1 / 4^ th ) of its initial concentration is twice the time taken to become (1 / 2 ) of the same. Als

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Time required for (99.9 % ) completion of a first order reaction is _______ times the time required for completion of (90 % ) reaction.(nearest integer)

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Consider the following single step reaction in gas phase at constant temperature. (2 ~A _ ( g ) + B _ ( g ) C _ ( g ) ) The initial rate of the reaction is recorded as ( r ₁ ) when

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During Kinetic study of reaction (2 A+B C+D ), the following results were obtained : ( array llll & A [M] & B [M] & initial rate of formation of D I & 0.1 & 0.1 & 6.0 10⁻³ II & 0.3

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Consider the following reaction, the rate expression of which is given below [ aligned & A + B C & rate = k [ A ]^ 1 / 2 [ ~B ]^ 1 / 2 aligned ] The reaction is initiated by taking

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Consider the following transformation involving first order elementary reaction in each step at constant temperature as shown below. (A+B Step 3 Step 1 C Step 2 P ) Some details of

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The following data were obtained during the first order thermal decomposition of a gas A at constant volume: A g → 2 B g + C g S. No Time/s Total pressure/(atm) 1 . 0 0 . 1 2 . 115

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The ratio of C 14 C 12 in a piece of wood is 1 8 part that of atmosphere. If half life of C 14 is 5730 years, the age of wood sample is ..... years.

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r = k A for a reaction, 50 % of A is decomposed in 120 minutes. The time taken for 90 % decomposition of A is ______ minutes.

JEE Main 2024 Solution View → 68

Integrated rate law equation for a first order gas phase reaction is given by (where P i is initial pressure and P t is total pressure at time t )

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NO 2 required for a reaction is produced by decomposition of N 2 O 5 in CCl 4 as by equation 2 N 2 O 5 ( g ) → 4 NO 2 ( g ) + O 2 ( g ) The initial concentration of N 2 O 5 is 3 mo

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The rate of first order reaction is 0 . 04 mol L - 1 s - 1 at 10 minutes and 0 . 03 mol L - 1 s - 1 at 20 minutes after initiation. Half life of the reaction is ______ minutes. (Gi

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The half-life of radioisotopic bromine - 82 is 36 hours. The fraction which remains after one day is _________ × 10 - 2 . (Given antilog 0 . 2006 = 1 . 587 ) Round off to the neare

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For a reaction taking place in three steps at same temperature, overall rate constant K = K 1 K 2 K 3 . If Ea 1 , Ea 2 and Ea 3 are 40 , 50 and 60 kJ / mol respectively, the overal

JEE Main 2024 Solution View → 73

Time required for completion of 99 . 9 % of first order reaction is ________ times of half life ( t 1 / 2 ) of the reaction

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Consider the following data for the given reaction 2 HI ( g ) → H 2 ( g ) + I 2 ( g ) HI molL - 1 0 . 005 0 . 01 0 . 02 Rate molL - 1 s - 1 7 . 5 × 10 - 4 3 . 0 × 10 - 3 1 . 2 × 10

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The plot of logk f versus 1 T for a reversible reaction A ( g ) ⇌ P ( g ) is shown. Pre-exponential factors for the forward and backward reactions are 10 15 s - 1 and 10 11 s

JEE Advanced 2023 Solution View → 76

For a reversible reaction A ⇌ B , the ∆ H forward reaction = 20 kJ mol – 1 . The activation energy of the uncatalyzed forward reaction is 300 kJ mol – 1 . W

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A ( g ) → 2 B ( g ) + C ( g ) is a first order reaction. The initial pressure of the system was found to be 800 mm Hg which increased to 1600 mm Hg after 10 min . The total p

JEE Main 2023 Solution View → 78

t 87 . 5 is the time required for the reaction to undergo 87 . 5 % completion and t 50 is the time required for the reaction to undergo 50 % completion. The relation between t 87 .

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The reaction 2 NO + Br 2 → 2 NOBr takes place through the mechanism given below NO + Br 2 ⇌ NOBr 2 fast NOBr 2 + NO → 2 NOBr slow The overall order of the reactio

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For a chemical reaction A + B → Product, the order is 1 with respect to A and B . Rate mol L - 1 S - 1 [A] mol L - 1 [B] mol L - 1 0 . 10 20 0 . 5 0 . 40 x 0 . 5 0 . 80 40 y

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KClO 3 + 6 FeSO 4 + 3 H 2 SO 4 → KCl + 3 Fe 2 ( SO 4 ) 3 + 3 H 2 O The above reaction was studied at 300 K by monitoring the concentration of FeSO 4 in which initial concentr

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The number of incorrect statement/s from the following is ______________ A. The successive half lives of zero order reactions decreases with time. B. A substance appearing as react

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A molecule undergoes two independent first order reactions whose respective half lives are 12 min and 3 min . If both the reactions are occurring then the time taken for the 50 % c

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The correct reaction profile diagram for a positive catalyst reaction.

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The number of given statement/s which is/are correct is_____ (A) The stronger the temperature dependence of the rate constant, the higher is the activation energy. (B) If a reactio

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Consider the following reaction that goes from A to B in three steps as shown below: Choose the correct option Number of Intermediates Number of Activated Complexes Rate determinin

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For the adsorption of hydrogen on platinum, the activation energy is 30   kJ   mol – 1 and for the adsorption of hydrogen on nickel, the activation energy is 41 . 4

JEE Main 2023 Solution View → 88

The graph which represents the following reaction is: C 6 H 5 3 C - Cl OH - Pyridine C 6 H 5 3 C - OH

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A → B The above reaction is of zero order. Half life of this reaction is 50 min . The time taken for the concentration of A to reduce to one-fourth of its initial value is mi

JEE Main 2023 Solution View → 90

A and B are two substances undergoing radioactive decay in a container. The half life of A is 15 min and that of B is 5 min . If the initial concentration of B is 4 times that of A

JEE Main 2023 Solution View → 91

The rate constant for a first order reaction is 20 min - 1 . The time required for the initial concentration of the reactant to reduce to its 1 32 level is _ _ _ _ _ _ × 10 -

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A → B The rate constants of the above reaction at 200 K and 300 K are 0 . 03 min - 1 and 0 . 05 min - 1 respectively. The activation energy for the reaction is J (Nearest int

JEE Main 2023 Solution View → 93

An organic compound undergoes first order decomposition. If the time taken for the 60 % decomposition is 540 s , then the time required for 90 % decomposition will be is _____ s. (

JEE Main 2023 Solution View → 94

If compound A reacts with B following first order kinetics with rate constant 2 . 011 × 10 - 3 s - 1 . The time taken by A (in seconds) to reduce from 7 g to 2 g will be _____

JEE Main 2023 Solution View → 95

For conversion of compound A → B , the rate constant of the reaction was found to be 4 . 6 × 10 - 5 Lmol - 1 s - 1 . The order of the reaction is _____ .

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For certain chemical reaction X → Y , the rate of formation of product is plotted against the time as shown in the figure. The number of Correct statement/s from the followin

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A first order reaction has the rate constant, k = 4 . 6 × 10 - 3 s - 1 . The number of correct statement/s from the following is/are Given: log 3 = 0 . 48 . A. Reaction comple

JEE Main 2023 Solution View → 98

For the first order reaction A → B the half life is 30 min . The time taken for 75 % completion of the reaction is mm. (Nearest integer) Given : log 2 = 0 . 3010 log 3 = 0 .

JEE Main 2023 Solution View → 99

A student has studied the decomposition of a gas A B 3 at 25 ° C . He obtained the following data p ( m m H g ) 50 100 200 400 Relative t 1 2 s 4 2 1 0 . 5 The order of the re

JEE Main 2023 Solution View → 100

The number of correct statement/s from the following is _____ . A.Larger the activation energy, smaller is the value of the rate constant. B. The higher is the activation energy, h

JEE Main 2023 Solution View → 101

Match the rate expressions in List-I for the decomposition of ( X ) with the corresponding profiles provided in List-II. (X_s ) and ( k ) are constants having appropriate units.

JEE Advanced 2022 Solution View → 102

Assuming 1 μg 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 tree after 100 years is_____ × 1

JEE Main 2022 Solution View → 103

The reaction between X and Y is first order with respect to X and zero order with respect to Y . Experiment X molL - 1 Y molL - 1 Initial rate mol L - 1 min - 1 I 0 . 1 0 . 1 2 &#2

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For a reaction, given below is the graph of lnk vs 1 T . The activation energy for the reaction is equal to____ cal mol - 1 .(Given : R = 2 calK - 1 mol - 1 ) ​​​​​​​

JEE Main 2022 Solution View → 105

For the given first order reaction A → B the half life of the reaction is 0 . 3010 min . The ratio of the initial concentration of reactant to the concentration of reactant a

JEE Main 2022 Solution View → 106

A → B Reactant Product If formation of compound B follows the first order of kinetics and after 70 minutes the concentration of A was found to be half of its initial concentr

JEE Main 2022 Solution View → 107

2 NO + 2 H 2 → N 2 + 2 H 2 O The above reaction has been studied at 800 ° C . The related data are given in the table below Reaction serial number Initial pressure of H

JEE Main 2022 Solution View → 108

At 30 ° C , the half life for the decomposition of AB 2 is 200 s and is independent of the initial concentration of AB 2 . The time required for 80 % of the AB 2 to decompose

JEE Main 2022 Solution View → 109

For a reaction A → 2 B + C the half lives are 100   s and 50   s when the concentration of reactant A is 0 . 5 and 1 . 0   mol   L = respectively. The ord

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For the decomposition of azomethane. CH 3 N 2 CH 3 g → CH 3 CH 3 g + N 2 a first order reaction, the variation in partial pressure with time at 600 K is given as The half lif

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The half life for the decomposition of gaseous compound A is 240   s when the gaseous pressure was 500 Torr initially. When the pressure was 250 Torr, the half life was found

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The equation k = 6 . 5 × 10 12 s - 1 e - 26000 K / T is followed for the decomposition of compound A . The activation energy for the reaction is ____ KJ mol - 1 . [nearest int

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The activation energy of one of the reactions in a biochemical process is 532611 J mol - 1 . When the temperature falls from 310 K to 300 K , the change in rate constant observed i

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A radioactive element has a half life of 200 days. The percentage of original activity remaining after 83 days is____(Nearest integer) (Given : antilog 0 . 125 = 1 . 333 , antilog

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For a first order reaction A → B , the rate constant, k = 5 . 5 × 10 - 14 s - 1 . The time required for 67 % completion of reaction is x × 10 - 1 times the half lif

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It 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 occurring at 300 K , the value of activatio

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The rate constant for a first order reaction is given by the following equation : lnk = 33 . 24 - 2 . 0 × 10 4 K T The Activation energy for the reaction is given by kJmol - 1

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Catalyst A reduces the activation energy for a reaction by 10 kJ mol - 1 at 300 K . The ratio of rate constants, k T , Catalysed k T , Uncatalysed is e x . The value of x is____[ne

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A 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 initial concentration. The time required for th

JEE Main 2022 Solution View → 120

At 345   K , the half life for the decomposition of a sample of a gaseous compound initially at 55 . 5   kPa was 340   s . When the pressure was 27 . 8   kPa ,

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