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JEE Main - Chemical Kinetics Important Questions (Free PDF Download)

Last updated date: 14th Jul 2024
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Download JEE Main Chemical Kinetics Important Questions with Solutions PDF: Score High Marks in JEE Main 2025

Vedantu has created a valuable resource for those preparing for JEE Main 2025. They've compiled a carefully selected set of JEE Main Chemical Kinetics Important Questions, curated precisely by Vedantu's Master Teachers. These teachers stay informed about the latest trends to ensure that the questions closely match the JEE Main exam syllabus. Chemical Kinetics important questions for JEE Main include multiple-choice questions (MCQs) and Integer Questions, allowing students to evaluate their skills at different levels. Alongside comprehensive solutions and explanations, the JEE Main Important Questions PDF helps students understand the correct strategies and techniques. Furthermore, the Chemical Kinetics Important Questions for JEE Main PDF incorporates Previous Year Questions from exams, providing students with ample practice opportunities to excel in the upcoming exam. The best part? All these resources are entirely free and easily accessible in PDF format for direct download from our website.


JEE Main Important Questions


Text, Images, Videos and PDF


JEE Main

Chapter Name:

Chemical Kinetics

Academic Session:



English Medium



Available Material:

Chapter-wise Important Questions with PDF

Students must consider the Chemical Kinetics Important Questions in JEE Main PDF as a crucial resource because this chapter explains the study of reaction rates and the factors that influence them. You can understand the significance of Chemical Kinetics in JEE Main by checking the information in the table provided below.

Year wise Weightage of Questions: JEE Main Chemical Kinetics

Sl. No.


Average No. Of Questions Asked

Marks per Question

Total Marks





















To reach your goals, prepare for your JEE Main 2025 exams using Vedantu’s Chemical Kinetics Important Questions PDF and the JEE Main Chemistry Syllabus 2025.

Competitive Exams after 12th Science

JEE Main 2025: What to Focus in Chemical Kinetics?

A few important topics students should consider when learning the Chemical Kinetics chapter in JEE Main 2025. Knowing the list of those topics will make it easy for you to prepare and focus on the JEE Mian exam. These subjects are selected from previous years' JEE Main exams. Therefore, before you get the Chemical Kinetics Important Questions for JEE Main, you can review this list of significant topics.

  • Rate of Reaction and Rate Laws

  • Order of Reaction

  • Rate Constant and Rate Equation

  • Integrated Rate Laws

  • Half-life and Reaction Order

  • Factors Affecting Reaction Rate

  • Collision Theory

  • Activation Energy and Arrhenius Equation

  • Reaction Mechanisms

  • Elementary Steps and Reaction Intermediates

  • Rate-Determining Step

  • Catalysis and Catalysts

  • Enzyme Kinetics

  • Reaction Kinetics in Industry

  • Reaction Kinetics in Biological Systems

Important Formulas from Chemical Kinetics

  1. Reaction Speed: It refers to the alteration in the concentration of reactant (or product) during a specified time period. The unit for the rate of reaction is mol L$^{-1}$ s$^{-1}$.

  1. Mean Rate: The speed of the reaction calculated over an extended time span is termed the average rate of reaction. It is calculated as  $\Delta X/\Delta t$, where $\Delta X$ represents the change in concentration, and $\Delta t$ is the time elapsed.

$Hg(1) + Cl_{2}\rightarrow HgCl_{2}(s);$

Rate of Reaction

$= - \frac{\Delta[Hg]}{\Delta t}=\frac{\Delta[Cl_{2}]}{\Delta t} = + \frac{\Delta[HgCl_{2}]}{\Delta t}$

$2Hl(g)\rightarrow H_{2}(g)+l_{2}$

Rate of reaction

$= - \frac{1}{2}\frac{\Delta [Hl]}{\Delta t} = + \frac{\Delta [H_{2}]}{\Delta t} = + \frac{\Delta [l_{2}]}{\Delta t}$

Quick Rate: This is how fast a reaction happens when we look at a really tiny bit of time. It's like finding out the speed right at that moment and is shown as dx/dt.

Quick Rate equals Average Rate when we make the time interval very, very small.

Rate Law or Equation: This is like a math formula that connects how fast a reaction goes with the amount of the stuff reacting. The 'K' in the formula is the rate constant.

Rate Constant: When we have the same amount of reactants, the rate of the reaction is known as the rate constant. It's also called the specific reaction rate.

Molecularity: This is about counting all the atoms, ions, or molecules involved in a reaction. It's always a whole number and is never more than three. It can't be zero.

For Example

Unimolecular reaction

$NH_{4}NO_{2}\rightarrow N_{2} + 2H_{2}O$

Biomolecular reaction

$2HI(g)\rightarrow H_{2}(g)+ I_{2}(g)$

Trimolecular reaction

$2NO(g) + O_{2}(g)\rightarrow 2NO_{2}(g)$

Reaction Type: The order of a reaction is the result of adding up the power (exponents) of the reactant concentrations in the rate formula. It might be a whole number or a fraction and can even be zero.

Zero Order Reaction: In this kind of reaction, the rate doesn't change, regardless of how much of the reactants you have. It's like saying rate = k[A]°, where 'k' is the rate constant, and the unit is mol L$^{-1}$ s$^{-1}$.

First-Order Reaction: Here, the rate of the reaction is directly tied to how much of the reacting substance you have. The rate constant for a first-order reaction is…

$k = \frac{2.303}{t} log \frac{a}{a-x}$ or $k = \frac{2.303}{t} log \frac{[A_{0}]}{[A]}$

Starting with 'a,' which is the initial amount, and as time 't' passes, the concentration of the reactant becomes (a – x). The unit of 'k' can be either s–1 or min–1. When you graph [A] against time 't,' it forms a straight line, and the slope of this line is equal to -k. Here, [A] represents the concentration of the reactant at a particular time 't,' and the unit of the rate constant is s–1.

1. Velocity of Chemical Reaction:

$Rate = \frac{\Delta c}{\Delta d}= mollit^{-1}time^{-1} = moldm^{-3}time^{-1}$

JEE Chemistry Important Questions: Explore Chapters with 2025 Links

Explore structured JEE 2025 Chemistry Important Questions through easily accessible chapter-wise links. Delve into crucial subjects, comprehend fundamental ideas, and enhance exam readiness. Equip yourself with an advantage using these targeted Important Questions.

Why Chemical Kinetics Important Questions are Essential In JEE Main Preparation? 

Chemical Kinetics chapter in JEE Main is not just theoretical concepts; they are the key to unlocking your potential. These topics hold substantial weightage in the exam, and understanding them thoroughly can significantly boost your scores, especially in JEE Main Important Questions. Here, we will delve into the importance of mastering this chapter and how it can empower you to excel in JEE Main.

Students study Chemical Kinetics important questions to excel in JEE Main, as it forms a crucial part of the chemistry syllabus. This chapter unravels the fascinating world of reaction rates, mechanisms, and how fast chemical processes occur, equipping students with the knowledge to tackle complex problem-solving and excel in competitive exams. It holds a significant importance of about 1.33% in the JEE Main. Expect direct questions from this part, making it a scoring section. Let's explore why this chapter holds such importance:

Introduction to Chemical Kinetics:

  • Imagine a bustling ballroom where molecules are the dancers, and reactions are the intricate choreography. Welcome to the captivating world of chemical kinetics, where we unravel the speed and pathways of reactions.

The Need for Speed:

  • Ever wondered why some reactions happen in the blink of an eye while others take ages? Chemical kinetics is the science of understanding reaction rates - how fast or slow reactions occur.

Reaction Rate Expressions:

  • Just as dancers follow specific moves, chemical reactions have their own rhythms. Reaction rate expressions showcase how the concentration of reactants influences the speed of reactions.

Factors Influencing Rates:

  • Let's add some spice to our dance! Temperature, concentration, catalysts, and surface area are like music beats that dictate the pace of reactions. Adjust these, and the dance changes.

Reaction Mechanisms:

  • Behind the scenes, dancers practice steps. Similarly, reactions often occur through multiple steps known as reaction mechanisms. Exploring these intricate routines helps us predict reaction pathways.

Order and Molecularity:

  • Imagine choreography with different dance groups. The order of a reaction defines how the concentration of reactants influences the rate. Molecularity reveals the number of molecules involved in a collision.

Rate Laws and Rate Constants:

  • Here's the cool part: we can write equations that capture how rate changes with concentrations. Rate laws and rate constants provide the mathematical groove for reactions.

Half-life: The Dance's Tempo:

  • Just like music tempo, reactions have a rhythm. Half-life is the time dancers take to leave the stage. It's a fascinating concept that varies with reaction orders.

Catalysts: Reaction Choreographers:

  • In our ballroom, catalysts are the dance choreographers. They speed up reactions without getting consumed. Catalysts provide alternate routes for reactions, making them efficient and thrilling.

Reaction Energy and Activation Energy:

  • Dance requires energy. Reactions, too, need energy to start. Activation energy is the initial push dancers need to kickstart the performance. It's like the first step on the dance floor.

Reaction Mechanism Puzzle:

  • Imagine piecing together a dance routine from scattered steps. Similarly, understanding reaction mechanisms is like solving a puzzle. Each step adds to the overall beauty of the dance.

Chemical kinetics isn't just about reactions; it's a dynamic journey into the heart of molecular movement. From understanding the beats of reaction rates to deciphering the intricate steps of mechanisms, this chapter transforms you into a molecular choreographer. So, put on your chemistry dancing shoes and let's dive into the rhythmic world of chemical kinetics!

Power of Equations: How Formulas Amplify Learning with Important Questions

JEE Main formulas are like the building blocks of success in the exam, and when combined with well-structured Important Questions, they become an indispensable tool for a comprehensive understanding of Chemical Kinetics in JEE Main.

When solving Chemical Kinetics Important Questions for JEE Main, make sure to use the associated formulas. This integration sharpens your understanding of the chapter, reinforces memory, and develops problem-solving skills—critical aspects of excelling in JEE Main 2025. Download the Important JEE Main Physics Formula PDF for free from Vedantu’s website and score more in your JEE Main 2025 Examinations.

Explore Further: Supplementary Resources for JEE Main 2025 Chemical Kinetics

Looking to enhance your JEE Main 2025 Chemical Kinetics preparation? Explore these Important materials:

  • Practice Papers: Enhance your abilities through focused practice.

  • MockTests: Replicate exam scenarios for increased confidence.

  • Sample Papers: Get acquainted with question formats.

  • Previous Year Question Papers (PYQPs): Understand exam patterns.

  • Revision Notes: Serve as a quick reference during exams, helping you recall key concepts and strategies.

Use these tools to improve comprehension and test-taking skills, boosting your JEE Main 2025 performance!

Access the supplementary resources for JEE Main 2025 here:

Excel in your Exams with Vedantu’s JEE Main Chemical Kinetics Important Questions

For those aspiring to excel in chemistry, it is imperative to tackle Chemical Kinetics important questions for JEE Main. This chapter is a fascinating field of chemistry that delves into the rates of chemical reactions and the factors influencing them. It helps us understand how fast reactions occur and why. When exploring important questions in this subject, resources like Vedantu's PDFs are invaluable. They simplify complex concepts into simple, human language, making learning accessible to all. These PDFs cover key topics like reaction mechanisms, rate laws, and catalysts, empowering students to master this fundamental aspect of chemistry. By grasping the intricacies of Chemical Kinetics in JEE Main, we not only gain a deeper insight into the world of chemistry but also its practical applications in various industries.

JEE Mains PYQ Chapterwise: Mastering  Chemical Kinetics with Past Papers

Conquering JEE Mains requires unwavering dedication and strategic preparation. One invaluable tool in your arsenal is the treasure trove of previous year question papers (PYQs). But navigating those years of questions can be overwhelming, especially for a crucial chapter like  Chemical Kinetics. Enter JEE Mains PYQ Chapterwise: your key to targeted practice and exam mastery in this foundational subject.

By delving into JEE Main Chapter-wise PYQs for  Chemical Kinetics, you gain laser-sharp focus on specific topics within this crucial domain. Imagine tackling your weakest areas, with a targeted set of past questions, building confidence and competence one problem at a time.

Whether you prefer the convenience of a JEE Mains Previous Year Questions Chapter Wise for  Chemical Kinetics with PDF download or prefer working directly from online resources, the benefits are undeniable. You'll hone your problem-solving skills, learn to apply theoretical knowledge to real-world scenarios involving  Chemical Kinetics, and develop the exam temperament needed to excel under pressure, especially when faced with  Chemical Kinetics questions. Remember, these questions are like blueprints for future JEE Mains papers – studying them is like peeking into the exam itself!

So, unleash the power of JEE Main PYQ Chapterwise for  Chemical Kinetics. Download your chosen resources, pick your weakest topic within this chapter, and start practicing. Each solved question is a step closer to your JEE Mains dream. Remember, consistency is key! Make chapterwise PYQs for  Chemical Kinetics a daily ritual, and watch your confidence and competence soar as you approach the exam with a laser-sharp focus and a wealth of knowledge at your fingertips, ready to conquer even the most challenging topics in  Chemical Kinetics.

FAQs on JEE Main - Chemical Kinetics Important Questions (Free PDF Download)

1. What are the JEE Main 2025 Important Questions for Chemical Kinetics?

The JEE Main 2025 Important Questions for Chemical Kinetics include topics such as rate of reaction, order of reaction, rate laws, rate constant, half-life, factors affecting reaction rates, and mechanisms of reactions.

2. What is the significance of studying Chemical Kinetics in JEE Main 2025?

Chemical Kinetics is crucial in JEE Main 2025 as it helps you understand how chemical reactions occur, their speed, and factors influencing them. It is essential for solving complex problems related to reaction mechanisms and predicting reaction outcomes, making it a vital topic for competitive exams.

3. How can I determine the order of a reaction from the JEE Main 2025 Important Questions for Chemical Kinetics?

To determine the order of a reaction, you can use the JEE Main 2025 Important Questions to experimentally find the change in the rate of reaction concerning changes in the concentration of reactants. By analyzing the data, you can determine the reaction's order, which may be zero, first, or second order.

4. What are the factors affecting the rate of chemical reactions, as mentioned in JEE Main 2025 Important Questions for Chemical Kinetics?

JEE Main 2025 Important Questions highlight several factors affecting reaction rates, including temperature, concentration of reactants, surface area, catalysts, and the nature of reactants. Understanding these factors is essential for predicting reaction outcomes and rates accurately.

5. How do I calculate the rate constant (k) using JEE Main 2025 Important Questions for Chemical Kinetics?

The rate constant (k) can be determined using JEE Main 2025 Important Questions by rearranging the rate law equation and substituting known values. Typically, it involves taking experimental data and plugging it into the rate equation, solving for k.

6. What is half-life, and how can I calculate it using JEE Main 2025 Important Questions in Chemical Kinetics?

Half-life (t½) is the time it takes for half of a reactant to be consumed. To calculate it using JEE Main 2025 Important Questions, you can use the half-life equation relevant to the order of reaction. For first-order reactions, t½ = 0.693/k, and for second-order reactions, t½ = 1/(k[A₀]).

7. How can I differentiate between a zero-order and first-order reaction using JEE Main 2025 Important Questions in Chemical Kinetics?

Differentiating between zero-order and first-order reactions with JEE Main 2025 Important Questions involves studying the rate-concentration relationships. In a zero-order reaction, the rate is independent of the concentration of reactants, while in a first-order reaction, the rate is directly proportional to the concentration.

8. Are the reaction mechanisms covered in JEE Main 2025 Important Questions for Chemical Kinetics?

Yes, JEE Main 2025 Important Questions for Chemical Kinetics often include questions related to reaction mechanisms. Understanding reaction mechanisms is essential for predicting product formation and reaction pathways, making it a crucial aspect of the exam.