Quantrex Academy Quantrex AcademyPYQs with solutions · JEE · NEET · NDA

Home · NEET UG · Chemistry · Chemical Kinetics

Chemical Kinetics — NEET UG Chemistry PYQs

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

819 questionsChemistrySolutions on every page
1

The combination of NO ₂(g) and CO (g) occurs in two steps as follows: What is the rate law for the reaction? 2 NO ₂ NO + NO ₃(k₁) - slow NO ₃ + CO CO ₂ + NO ₂(k₂) - fast

MHT CET Medical 2026 Solution View → 2

The slope of the graph [ A ]_t against time for zero order reaction is

MHT CET Medical 2026 Solution View → 3

For the reaction C ₂ H ₅ Br _ (l) C ₂ H _ 4(g) + HBr , r = K( C ₂ H ₅ Br ) What is order and molecularity of the reaction respectively ?

MHT CET Medical 2026 Solution View → 4

The decomposition of N ₂ O _ 5(g) occurs as: 2 N ₂ O _ 5(g) 4 NO _ 2(g) + O _ 2(g) . If initial concentration of N ₂ O _ 5(g) is 1.63 10⁻² mol L ⁻¹ and after 400 seconds it is 1.36

MHT CET Medical 2026 Solution View → 5

Which of the following statements represents rate of reaction?

MHT CET Medical 2026 Solution View → 6

What is the order of reaction for the following? 2 H ₂ O ₂(l) 2 H ₂ O (l) + O ₂(g)

MHT CET Medical 2026 Solution View → 7

2 A 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, then the time taken to complete 75 % of the reaction will be

NEET 2026 Solution View → 8

Match List I with List II : List I (Order of reaction) List II (Unit of rate constant) A. Zero order I. mol ⁻¹ L s ⁻¹ B. First order II. mol ⁻² L ² s ⁻¹ C. Second order III. s ⁻¹ D

NEET 2026 Solution View → 9

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 K ⁻¹ mol ⁻¹ , the temperature at which the rate c

NEET 2026 Solution View → 10

Given below is an expression for the rate constant of a first order reaction occurring at a certain temperature, T (K). k = 14.34 - 1.25 10⁴ T The energy of activation in kcal mol

NEET 2026 Solution View → 11

For a certain reaction R Product, the plot of concentration [R] vs time has a negative slope as shown. The order of reaction is :

NEET 2026 Solution View → 12

If the half-life ( t _ 1 / 2 ) for a first order reaction is 1 minutes, then the time required for 99.9 % completion of the reaction is closest to:

NEET 2025 Solution View → 13

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 reduced to 0.9 ~mol ~L ⁻¹ ? (Given : 2=0.301 )

NEET 2025 Solution View → 14

Following data is for a reaction between reactants A and B : The order of the reaction with respect to A and B , respectively, are

NEET 2024 Solution View → 15

Which of the following plot represents the variation of k versus 1 T in accordance with Arrhenius equation?

NEET 2024 Solution View → 16

Activation energy of any chemical reaction can be calculated if one knows the value of

NEET 2024 Solution View → 17

Rate constants of a reaction at 500 K and 700 K are 0.04 ~s ⁻¹ and 0.14 ~s ⁻¹ , respectively; then, activation energy of the reaction is : (Given: 3.5=0.5441, R =8.31 ~J ~K ⁻¹ ~mol

NEET 2024 Solution View → 18

The rate of a reaction quadruples when temperature changes from 27^ C to 57^ C . Calculate the energy o activation. Given R =8.314 ~J ~K ⁻¹ ~mol ⁻¹, 4=0.6021

NEET 2024 Solution View → 19

Which plot of k vs 1 ~T is consistent with Arrhenius equation?

NEET 2024 Solution View → 20

The correct option for the rate law that corresponds to overall first order reaction is

NEET 2023 Solution View → 21

For a reaction 3 ~A 2 ~B The average rate of appearance of B is given by [B] t . The correct relation between the average rate of appearance of B with the average rate of disappear

NEET 2023 Solution View → 22

Given below are two statements: one labelled as Assertion A and other is labelled as Reason R : Assertion A: A reaction can have zero activation energy Reason R: The minimum extra

NEET 2023 Solution View → 23

For a certain reaction, the rate = k   [ A ] 2   [ B ] , when the initial concentration of A is tripled keeping concentration of B constant, the initial rate would

NEET 2023 Solution View → 24

The half life of a first order reaction is 2000 years. If the concentration after 8000 years is 0.02 M , then the initial concentration was :

NEET 2022 Solution View → 25

For a chemical reaction 4 ~A +3 ~B 6 C +9 D rate of formation of C is 6 10⁻² ~mol ~L ⁻¹ ~s ⁻¹ and rate of disappearance of A is 4 10⁻² ~mol ~L ⁻¹ ~s ⁻¹ . The rate of reaction and a

NEET 2022 Solution View → 26

The given graph is a representation of kinetics of a reaction. The y and x axes for zero and first order reactions, respectively are

NEET 2022 Solution View → 27

For a first order reaction A → Products, initial concentration of A is 0 . 1   M , which becomes 0 . 001   M after 5 minutes. Rate constant for the reaction in min

NEET 2022 Solution View → 28

For a reaction A → B , enthalpy of reaction is - 4 . 2   kJ   mol - 1 and enthalpy of activation is 9 . 6   kJ   mol - 1 . The correct potential energy pr

NEET 2021 Solution View → 29

The slope of Arrhenius Plot lnk   v/s  1   T of first order reaction is - 5 × 10 3   K . The value of E a of the reaction is. Choose the correct optio

NEET 2021 Solution View → 30

The half-life for a zero order reaction having 0 . 02   M initial concentration of reactant is 100   s . The rate constant (in mol   L - 1 s - 1 ) for the reaction i

NEET 2020 Solution View → 31

In collision theory of chemical reaction, Z AB represents

NEET 2020 Solution View → 32

The rate constant for a first order reaction is 4.606 × 10 – 3   s – 1 . The time required to reduce 2.0   g of the reactant to 0.2   g is :

NEET 2020 Solution View → 33

An increase in the concentration of the reactants of a reaction leads to change in

NEET 2020 Solution View → 34

Assertion : Half-life period of a reaction of first order is independent of initial concentration. Reason : Half-life period for a first order reaction, t_ 1 / 2 = 2.303 k 2 .

AIIMS 2019 Solution View → 35

The decomposition of NH ₃ on platinum surface is zero order reaction. The rates of production of N ₂ and H ₂ are respectively (k=2.5 10⁻⁴ ~mol ~L ⁻¹ ~s ⁻¹ )

AIIMS 2019 Solution View → 36

For a first order gas phase reaction, A_ (g) 2 B_ (g) +C_ (g) P₀ be initial pressure of A and P_t the total pressure at time ' t '. Integrated rate equation is

AIIMS 2019 Solution View → 37

What is the activation energy ( kJ / mol ) for a reaction if its rate constant doubles when the temperature is raised from 300 ~K to 400 ~K ? (R=8.314 ~J ~mol ⁻¹ ~K ⁻¹ )

AIIMS 2019 Solution View → 38

Find out the time required for 2 / 3^ rd completion of a first order reaction, if the value of rate constant is 4.3 10⁻⁴ ~s ⁻¹ .

AIIMS 2019 Solution View → 39

If half-life of a substance is 36 minutes. Find amount left after 2 hrs . Initial amount is 10 gm ?

JIPMER 2019 Solution View → 40

Formula for half- life of a zero order reaction is

JIPMER 2019 Solution View → 41

A first order reaction has a rate constant of 2.303 10⁻³ ~s ⁻¹ . The time required for 40 ~g of this reactant to reduce to 10 ~g will be [Given that ₁₀ 2=0.3010 ]

NEET 2019 Solution View → 42

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

NEET 2019 Solution View → 43

For the chemical reaction N 2 g + 3 H 2 g ⇋ 2 N H 3 g , the correct option is:

NEET 2019 Solution View → 44

For a reaction, activation energy E _ a =0 and the rate constant at 200 ~K is 1.6 10^6 ~s ⁻¹ . The rate constant at 400 ~K will be [Given that gas constant R =8.314 JK ⁻¹ ~mol ⁻¹ ]

NEET 2019 Solution View → 45

If energy of activation of the reaction is 53.6 ~kJ ~mol ⁻¹ and the temperature changes from 27^ C to 37^ C then the value of ( k_ 37^ C k_ 27^ C ) is

AIIMS 2018 Solution View → 46

Which option is valid for a zero order reaction?

AIIMS 2018 Solution View → 47

In the reversible reaction, 2 NO ₂ k ₂ k ₁ N ₂ O ₄ the rate of disappearance of NO ₂ is equal to

JIPMER 2018 Solution View → 48

When initial concentration of the reactant is doubled, what happens to the half-life period of a zero order reaction?

NEET 2018 Solution View → 49

What is the correct difference between first and second order reactions?

NEET 2018 Solution View → 50

The chemical reaction, 2 O ₃ 3 O ₂ proceeds as follows : O ₃ O ₂+ O .(fast) Step 2: O + O ₃ 2 O ₂ .(slow) The rate law expression should be

AIIMS 2017 Solution View → 51

The temperature dependence of a reaction is represented by the Arrhenius equation : k=- E_a R T + A Which among the following is wrong conclusion about the given plot?

AIIMS 2017 Solution View → 52

In the following graph. The slope of line A B gives the information of the

JIPMER 2017 Solution View → 53

For the chemical reaction, 2 O ₃ 3 O ₂ The reaction proceed as follows gathered O ₃ O ₂+ O (fast) O + O ₃ 2 O ₂ (slow) gathered The rate law expression will be

JIPMER 2017 Solution View → 54

A first order reaction is 50 % completed in 1.26 10¹⁴ ~s . How much time would it takes for 100 % completion?

JIPMER 2017 Solution View → 55

A first-order reaction has a specific reaction rate 10 - 2 sec - 1 ⁡ . How much time will it take for 20   g the reactant to reduce to 5   g ?

NEET 2017 Solution View → 56

Mechanism of a hypothetical reaction X 2 + Y 2 → 2 XY is given below: (i) X 2 → X + X   fast (ii) X + Y 2 ⇌ XY + Y   slow (iii) X + Y → XY  

NEET 2017 Solution View → 57

During the decomposition of H ₂ O ₂ to give oxygen, 48 ~g O ₂ is formed per minute at a certain point of time. The rate of formation of water at this point is

AIIMS 2016 Solution View → 58

A first order reaction, which is 30 % complete in 30 minutes has a half-life period of

AIIMS 2016 Solution View → 59

Look at the graph Choose the correct equation from the following which best suited to the above graph

JIPMER 2016 Solution View → 60

Two similar reactions have the same rate constant at 25^ C , but at 35^ C , one of the reaction has a higher rate constant than the other. The appropriate reason for this is

JIPMER 2016 Solution View → 61

At radioactive equilibrium, the ratio between two atoms of radioactive elements A and B is 3.1 10^9: 1 . If the half-life period of A is 2 10¹⁰ yrs, then the half-life of B is

JIPMER 2016 Solution View → 62

The decomposition of phosphine P H 3 on tungsten at low pressure is a first-order reaction. It is because the

NEET 2016 Solution View → 63

The rate of a first-order reaction is 0.04   m o l   l - 1 s - 1 at 10 second and 0.03   m o l   l - 1 s - 1 at 20 seconds after initiation of the reaction. The

NEET 2016 Solution View → 64

The addition of a catalyst during a chemical reaction alters which of the following quantities?

NEET 2016 Solution View → 65

In a decay process _Z^A X changes into _ Z-1 ^A Y . Which process is this?

AIIMS 2015 Solution View → 66

For reaction a A x P , when [A]=2.2 mM , the rate was found to be 2.4 mM s ⁻¹ . On reducing concentration of A to half, the rate changes to 0.6 mM s ⁻¹ . The order of reaction with

AIIMS 2015 Solution View → 67

A hypothetical reaction, X₂+Y₂ 2 X Y follows the following mechanism X₂ X+X . . . . . . . fast X+Y₂ X Y+Y slow X+Y X Y .......... fast The order of the overall reaction is

JIPMER 2015 Solution View → 68

The variation of concentration of the product P with time in the reaction, A P is shown in following graph. The graph between -d[A] d t and time will be of the type

JIPMER 2015 Solution View → 69

The rate constant of the reaction A ⟶ B is 0.6 × 10 - 3 mole per liter per second. If the initial concentration of A is 5 M, then the concentration of B after 20 minute

NEET 2015 Solution View → 70

The activation energy of a reaction can be determined from the slope of which of the following graphs?

NEET 2015 Solution View → 71

When initial concentration of a reactant is doubled in a reaction, its half-life period is not affected. The order of the reaction is:

NEET 2015 Solution View → 72

75 % of a zero order reaction complete in 4 ~h 87.5 % of the same reaction completes in

AIIMS 2014 Solution View → 73

For the reaction A_ (g) B_ (g) +C_ (g) , the rate constant is given as (P_i . is initial pressure and P_t is pressure at time t )

AIIMS 2014 Solution View → 74

Observe the following reaction 2 A+B C The rate of formation of C is 2.2 10⁻³ ~mol ~L ⁻¹³ ~min ⁻¹ . What is the value of - d[A] d t ( . in . mol L ⁻¹ ⁻¹ ) ?

JIPMER 2014 Solution View → 75

The plot of a concentration of the reactant versus time for a reaction is a straight line with a negative slope. The reaction follows a

AIIMS 2013 Solution View → 76

For a reaction between A and B the order with respect to A is 2 and the other with respect to B is 3 . The concentrations of both A and B are doubled, the rate will increase by a f

NEET 2013 Solution View → 77

What is the activation energy for a reaction if its rate doubles when the temperature is raised from 20^ C to 35^ C ? (R=8.314 ~J ~mol ⁻¹ ~K ⁻¹ )

NEET 2013 Solution View → 78

A reaction having equal energies of activation for forward and reverse reactions has

NEET 2013 Solution View → 79

A reaction is 50 % complete in 2 hours and 75 % complete in 4 hours. The order of reaction is:

NEET 2013 Solution View → 80

If t_ 1 / 2 v 1 a^2 is a straight line graph then determine the order of reaction.

AIIMS 2012 Solution View → 81

For a reaction, r=k ( CH ₃ COCH ₃ )^ 3 / 2 then unit of rate of reaction and rate constant respectively is

AIIMS 2012 Solution View → 82

Assertion : Rate of reaction doubles when concentration of reactant is doubled if it is a first order reaction. Reason : Rate constant also doubles.

AIIMS 2012 Solution View → 83

For a zero order reaction

JIPMER 2012 Solution View → 84

In the first order reaction, 75 % of the reactant gets disappeared in 1.386 hours. The rate constant of the reaction is

JIPMER 2012 Solution View → 85

In a reaction, A+B Product, rate is doubled when the concentration of B is doubled, and rate increases by a factor of 8 when the concentrations of both the reactants (A and B ) are

NEET 2012 Solution View → 86

In a zero order reaction for every 10^ rise of temperature, the rate is doubled. If the temperature is increased from 10^ C to 100^ C , the rate of the reaction will become

NEET 2012 Solution View → 87

Activation energy (E_a ) and rate constants (k₁ . and .k₂ ) of a chemical reaction at two different temperatures (T₁ . and .T₂ ) are related by

NEET 2012 Solution View → 88

For a first order gas phase reaction- A_ (g) 2 B_ (g) +C_ (g) P₀ be initial pressure of A and P_t the total pressure at time ' t '. Integrated rate equation is

AIIMS 2011 Solution View → 89

Assertion : Two different reactions can never have same rate of reaction. Reason : Rate of reaction always depends only on frequency of collision and Arrhenius factor.

AIIMS 2011 Solution View → 90

The rate equation for a reaction, A B is r=k[A]^0 . If the initial concentration of the reactant is a ~mol dm ⁻³ , the half-life period of the reaction is

JIPMER 2011 Solution View → 91

2 g of a radioactive sample having half-life of 15 days was synthesised on 1st Jan 2009. The amount of the sample left behind on 1st March, 2009 (including both the days) is

JIPMER 2011 Solution View → 92

The half-life of a substance in a certain enzyme-catalysed reaction is 138 ~s . The time required for the concentration of the substance to fall from 1.28 mg L ⁻¹ to 0.04 mg L ⁻¹ i

NEET 2011 Solution View → 93

Which one of the following statements for the order of a reaction is incorrect?

NEET 2011 Solution View → 94

The rate of reaction 2 ~N ₂ O ₅ 4 NO ₂+ O ₂ can be written in three ways aligned -d [ ~N ₂ O ₅ ] d t & =k [ ~N ₂ O ₅ ] d [ NO ₂ ] d t & =k^ [ N ₂ O ₅ ] d [ O ₂ ] d t & =k^ [ N ₂ O

NEET 2011 Solution View → 95

The unit of rate constant for a zero order reaction is

NEET 2011 Solution View → 96

For a 1^ st order reaction if concentration is doubled then rate of reaction becomes

AIIMS 2010 Solution View → 97

For a reaction X Y , the graph of the product concentration (x) versus time (t) came out to be a straight line passing through the origin. Hence the graph of -d[X] d t and time wou

AIIMS 2010 Solution View → 98

Assertion : The position of an element in periodic table after emission of one - and two -particles remains unchanged. Reason : Emission of one - and two -particles give isotope of

AIIMS 2010 Solution View → 99

Assertion : The overall order of the reaction is the sum of the exponents of all the reactants in the rate expression. Reason : There are many higher order reactions.

AIIMS 2010 Solution View → 100

What is the order of the reaction?

JIPMER 2010 Solution View → 101

For an endothermic reaction, energy of activation is E_a and enthalpy of reaction is H (both of these in kJ / mol ). Minimum value of E_a will be

NEET 2010 Solution View → 102

During the kinetic study of the reaction, 2 ~A + B C + D , following results were obtained ( array |c|c|c|c| Run & [A] / mol~ L ⁻¹ & [B] / mol~ L ⁻¹ & array cc Initial rate of form

NEET 2010 Solution View → 103

The rate of the reaction, 2 NO + Cl ₂ 2 NOCl is given by the rate equation, rate = k [ NO ]^2 [ Cl ₂ ] The value of the rate constant can be increased by

NEET 2010 Solution View → 104

For the reaction ( N ₂ O ₅( g ) 2 NO ₂( g )+(1 / 2) O ₂( g ) ) the value of rate of disappearance of ( N ₂ O ₅ ) is given as (6.25 10⁻³ ~mol ~L ⁻¹ ~s ⁻¹ ). The rate of formation of

NEET 2010 Solution View → 105

In a homogenous reaction A B+C+D the initial pressure was P₀ and after time t it was P . Expression for rate constant k in terms of P₀ , P and t will be

AIIMS 2009 Solution View → 106

Assertion : In rate law, unlike in the expression for equilibrium constants, the exponents for concentrations do not necessarily match the stoichiometric coefficients. Reason : It

AIIMS 2009 Solution View → 107

Which curve corresponds to the temperature dependence of the rate R of a simple one step reaction?

AIIMS 2009 Solution View → 108

If 50 % of a radioactive substance dissociates in 15 min , then the time taken by substance to dissociate 99 % will be

JIPMER 2009 Solution View → 109

Half-life period of a first order reaction is 1386 ~s . The specific rate constant of the reaction is

NEET 2009 Solution View → 110

For the reaction, A+B products, it is observed that (1) On doubling the initial concentration of A only, the rate of reaction is also doubled and (2) On doubling the initial concen

NEET 2009 Solution View → 111

For the reaction, N ₂+3 H ₂ 2 NH ₃ , if d [ NH ₃ ] dt =2 10⁻⁴ ~mol ~L ⁻¹ ~s ⁻¹ , the value of - d [ H ₂ ] dt would be

NEET 2009 Solution View → 112

Half-life period of a first-order reaction is 1386 seconds. The specific rate constant of the reaction is :

NEET 2009 Solution View → 113

For the reaction A + B products, it is observed that : A. On doubling the initial concentration of A only, the rate of reaction is also doubled and B. On doubling the initial conce

NEET 2009 Solution View → 114

For the reaction, N ₂+3 H ₂ 2 NH ₃ , If d [ NH ₃ ] dt =2 10⁻⁴ ~mol ~L ⁻¹ ~s ⁻¹ , The value of - d [ H ₂ ] dt would be -

NEET 2009 Solution View → 115

A 0.0020 M aqueous solution of an ionic compound Co ( NH ₃ )₅ ( NO ₂ ) Cl freezes at -0.00732^ C . Number of moles of ions which 1 mole of ionic compound produces on being dissolve

NEET 2009 Solution View → 116

The values of H and S for the reaction, C (graphite) + CO ₂( ~g ) 2 CO ( g ) are 170 ~kJ and 170 JK ⁻¹ respectively. This reaction will be spontaneous at -

NEET 2009 Solution View → 117

In the reaction, ( BrO ₃⁻ )(aq.) (+5 Br ⁻ )(aq.) (+6 H ⁺ )(aq.) ( 3 Br ₂( l )+3 H ₂ O ) (l) .The rate of appearance of bromine ( Br ₂ ) is related to rate of disappearance of bromi

NEET 2009 Solution View → 118

In the reaction BrO ₃⁻( aq )+5 Br ⁻( aq )+6 H ⁺ 3 Br ₂(l)+3 H ₂ O (l) The rate of appearance of bromine ( Br ₂ ) is related to rate of disappearance of bromide ions as following

NEET 2009 Solution View → 119

For the reaction, (2 NO ₂+ F ₂ 2 NO ₂ ~F ), following mechanism has been provided. [ aligned & NO ₂+ F ₂ Slow NO ₂ ~F + F & NO ₂+ F Fast NO ₂ ~F aligned ] Thus, rate expression of

AIIMS 2008 Solution View → 120

Acid hydrolysis of sucrose is a

AIIMS 2008 Solution View →
Practice all Chemical Kinetics questions in the app →