What does Chemical Kinetics cover for NEET Chemistry?

7 lessons: Arrhenius Theory, Collision Theory, Factors Affecting Rate, Half Life, Order Molecularity, Rate of Reaction and Zero First Order Kinetics.

How often has Chemical Kinetics come up in NEET past papers?

Our set of verified past papers has 12 questions from this unit, from NEET 2020, 2021, 2022, 2023, 2024, 2025 and 2026. Each is answered against the official NTA key.

Is the Chemical Kinetics material free?

Yes. All 7 lessons and 56 practice questions are free, with no login needed.

Chemical Kinetics

7 lessons

Topic index in NCERT order

7 of 7 lessons by the NCERT chapter they teach from, in book order. The page is the first printed page of your NCERT book the lesson cites; PYQs are the past NEET questions on that topic.

Class 12 Chemistry, Chapter 3

Arrhenius Theory

8 MCQs5 PYQs2 revision cardsWorked example

Easy Recall (3)Direct Application (3)Calculation (2)

Collision Theory

8 MCQs1 PYQs5 revision cardsWorked example

Easy Recall (3)Direct Application (3)Concept Trap (1)Calculation (1)

Factors Affecting Rate

8 MCQs4 revision cardsWorked example

Concept Trap (1)Easy Recall (3)Direct Application (3)Calculation (1)

Half Life

8 MCQs1 PYQs6 revision cardsWorked example

Easy Recall (3)Direct Application (3)Calculation (2)

Order Molecularity

8 MCQsWorked example

Easy Recall (3)Direct Application (3)Concept Trap (1)Calculation (1)

Rate of Reaction

8 MCQsWorked example

Easy Recall (3)Direct Application (3)Concept Trap (1)Calculation (1)

Zero First Order Kinetics

8 MCQs4 PYQs4 revision cardsWorked example

Easy Recall (3)Direct Application (3)Calculation (1)Concept Trap (1)

Past-paper questions from this unit

12 questions from NEET 2020, 2021, 2022, 2023, 2024, 2025, 2026. Answers verified against NTA official keys.

By year in our set: 2020 (2) · 2021 (1) · 2022 (1) · 2023 (2) · 2024 (2) · 2025 (2) · 2026 (2)

Lesson: Zero First Order Kinetics

NEET 2026

2A → 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

11.5 min

20.75 min

31.0 min

42.0 min

NTA Answer: Option 2(final)

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Lesson: Arrhenius Theory

NEET 2026

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 constant becomes e² min⁻¹, is

1125 K

2150 K

3200 K

4250 K

NTA Answer: Option 3(final)

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Lesson: Zero First Order Kinetics

NEET 2025

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: log 2 = 0.301)

121.0 s

269.3 s

323.1 s

4210 s

NTA Answer: Option 2(final)

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Lesson: Half Life

NEET 2025

If the half-life (t1/2) for a first order reaction is 1 minute, then the time required for 99.9% completion of the reaction is closest to :

110 minutes

22 minutes

34 minutes

45 minutes

NTA Answer: Option 1(final)

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Lesson: Arrhenius Theory

NEET 2024Revised key

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

1rate constant at standard temperature

2probability of collision

3orientation of reactant molecules during collision

4rate constant at two different temperatures

NTA Answer: Option 4(revised_final)

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Lesson: Arrhenius Theory

NEET 2024Revised key

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 K⁻¹ mol⁻¹, log4 = 0.6021

138.04 kJ/mol

2380.4 kJ/mol

33.80 kJ/mol

43804 kJ/mol

NTA Answer: Option 1(revised_final)

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NEET 2023

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

1Increase by a factor of six

2Increase by a factor of nine

3Increase by a factor of three

4Decrease by a factor of nine

NTA Answer: Option 2(final)

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Lesson: Arrhenius Theory

NEET 2023

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 zero activation energy. Reasons R : The minimum extra amount of energy absorbed by reactant molecules so that their energy becomes equal to threshold value, is called activation energy. In the light of the above statements, choose the correct answer from the options given below :

1Both A and R are true and R is NOT the correct explanation of A

2A is true but R is false

3A is false but R is true

4Both A and R are true and R is the correct explanation of A

NTA Answer: Option 3(final)

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Lesson: Zero First Order Kinetics

NEET 2022

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–1 is

10.2303

21.3818

30.9212

40.4606

NTA Answer: Option 3(final)

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Lesson: Arrhenius Theory

NEET 2021

The slope of Arrhenius plot (ln k v/s 1/T) of first order reaction is −5 × 10³K. The value of Eₐ of the reaction is. Choose the correct option for your answer. [Given R = 8.314 JK⁻¹mol⁻¹]

1−83 kJ mol⁻¹

241.5 kJ mol⁻¹

383.0 kJ mol⁻¹

4166 kJ mol⁻¹

NTA Answer: Option 2(final)

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Lesson: Zero First Order Kinetics

NEET 2020

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 :

11000 s

2100 s

3200 s

4500 s

NTA Answer: Option 4(final)

Report an error · Every fix is public: corrections log

Lesson: Collision Theory

NEET 2020

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

1collision frequency

2activation energy

3heat of reaction

4threshold energy

NTA Answer: Option 1(final)

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Exam traps and common mistakes in this unit

Lesson: Half Life

Trap

Rate law from EXPERIMENT, not stoichiometry. Order = sum of exponents in rate = k[A]^x[B]^y. Molecularity follows mechanism.

Formulas in this unit

Lesson: Arrhenius Theory

Arrhenius equation

k = A e^{- E_{a} / (R T)}

Temperature dependence of rate constant. Higher Ea → more T-sensitive rate.

Symbol	Quantity	SI Unit
A	frequency factor	same as k
Ea	activation energy	J/mol
R	gas constant	J/mol/K
T	temp	K

Valid when

T in kelvins
Most reactions in modest T range

Lesson: Arrhenius Theory

Arrhenius for two temperatures

ln \frac{k _{2}}{k _{1}} = \frac{E _{a}}{R} (\frac{1}{T _{1}} - \frac{1}{T _{2}})

Compare rate constants at two temperatures to find Ea.

Symbol	Quantity	SI Unit
k1, k2	rate constants	same units
T1, T2	temperatures	K
Ea	activation energy	J/mol

Valid when

A constant across temperature range
T in kelvins

Lesson: Half Life

First-order kinetics

ln \frac{[ A ] _{0}}{[ A ]} = k t; t_{1/2} = \frac{0.693}{k}

Concentration decays exponentially. Half-life independent of [A]_0.

Symbol	Quantity	SI Unit
[A]	conc at time t	mol/L
k	rate constant	1/s
t	time	s

Valid when

First-order reaction (rate = k[A])

Lesson: Half Life

Zero-order kinetics

[A] = [A]_{0} - k t

Concentration decays linearly. Half-life depends on initial concentration.

Symbol	Quantity	SI Unit
[A]_0	initial conc	mol/L
k	rate constant	mol/L/s
t	time	s

Valid when

Zero-order reaction (rate = k, no concentration dependence)

NEET question patterns in this unit

Lesson: Arrhenius Theory

Find Ea from rate-constant ratio at two temperatures using ln(k2/k1) = Ea/R · (1/T1 − 1/T2).

Multi StepMedium

Common distractors

wrong sign of 1 over t

Mixes T1 and T2 in subtraction

Lesson: Half Life

First-order: t_1/2 = 0.693/k. Apply or invert to find k or remaining concentration.

Direct ApplicationEasy

Common distractors

uses zero order formula

Plugs into [A]_0/(2k) wrong-order formula

Questions about this unit

What does Chemical Kinetics cover for NEET Chemistry?: 7 lessons: Arrhenius Theory, Collision Theory, Factors Affecting Rate, Half Life, Order Molecularity, Rate of Reaction and Zero First Order Kinetics.
How often has Chemical Kinetics come up in NEET past papers?: Our set of verified past papers has 12 questions from this unit, from NEET 2020, 2021, 2022, 2023, 2024, 2025 and 2026. Each is answered against the official NTA key.
Is the Chemical Kinetics material free?: Yes. All 7 lessons and 56 practice questions are free, with no login needed.