Chemical Kinetics - JEE Main Previous Year Questions with Solutions
eSaral > JEE Main Chemistry PYQs > Chemical Kinetics
JEE Main Previous Year Papers Questions of Chemistry with Solutions are available at eSaral. Practicing JEE Mains chapter-wise questions of Chemistry will help the JEE aspirants in realizing the question pattern, as well as help in analyzing weak & strong areas. Simulator Previous Years AIEEE/JEE Mains Questions
[aieee-2010] 
(1) $\mathrm{k}_{1}=2 \mathrm{k}_{2} \mathrm{e}^{\mathrm{E}_{2} / \mathrm{RT}}$ (2) $\mathrm{k}_{1}=\mathrm{k}_{2} \mathrm{e}^{\mathrm{Ea}_{1} / \mathrm{RT}}$ (3) $\mathrm{k}_{2}=\mathrm{k}_{1} \mathrm{e}^{\mathrm{Ea}_{2} / \mathrm{RT}}$ (4) $\mathrm{k}_{1}=\mathrm{A} \mathrm{k}_{2} \mathrm{e}^{\mathrm{Ea}_{1} / \mathrm{RT}}$ [aieee-2011] 
(1) $\frac{\mathrm{dc}}{\mathrm{dt}}=\mathrm{k}[\mathrm{A}][\mathrm{B}]^{2}$ (2) $\frac{\mathrm{dc}}{\mathrm{dt}}=\mathrm{k}[\mathrm{A}]$ (3) $\frac{\mathrm{dc}}{\mathrm{dt}}=\mathrm{k}[\mathrm{A}][\mathrm{B}]$ (4) $\frac{\mathrm{dc}}{\mathrm{dt}}=\mathrm{k}[\mathrm{A}]^{2}[\mathrm{B}]$ [J-main 2014] 
[JEE - Main 2016] 
Frequently Asked Questions
Find answers to common questions.
What are the most important topics in Chemical Kinetics for JEE Main?
The three highest-yield topics are: (1) First order integrated rate law and half-life, (2) Arrhenius equation and activation energy, and (3) Determination of rate law order from experimental data. These three sub-topics together covered over 70% of all Chemical Kinetics marks in JEE Main papers from 2009 to 2018.
Is Chemical Kinetics difficult for JEE Main?
Chemical Kinetics is rated medium difficulty. The numerical problems — half-life, activation energy, order determination — follow predictable patterns. If you have clear concepts from NCERT and have solved 10–15 PYQs with worked solutions, this chapter becomes one of the more scoring areas in Physical Chemistry
What is the weightage of Chemical Kinetics in JEE Main?
Chemical Kinetics typically contributes 1–2 questions (4–8 marks) per JEE Main session. Over the past decade, it has appeared in every paper. The chapter is part of the Physical Chemistry section, which carries approximately 35–40% of the total Chemistry marks according to the NTA JEE Main syllabus.
Can I solve Chemical Kinetics JEE Main questions without calculus?
Yes. JEE Main Chemical Kinetics questions use pre-derived integrated rate law formulas — you do not need to derive them during the exam. Memorise the four key formulas (first order, zero order, Arrhenius, half-life relations) and practise substituting numbers accurately. Calculus understanding helps conceptually but is not required for calculation steps in the MCQ format.
What is the difference between order and molecularity?
Order of reaction is determined experimentally from the rate law and can be zero, fractional, or any integer. Molecularity refers to the number of molecules involved in an elementary step of a reaction mechanism and is always a positive integer (1, 2, or 3). For overall reactions with multiple steps, only order (not molecularity) is meaningful.
How do you determine the order of a reaction in JEE Main problems?
Determine order by comparing initial rate data from two experiments where only one reactant concentration changes. Set up the ratio $r_1/r_2 = (c_1/c_2)^n$ and solve for n. If rate data is given as a function of time (not initial rates), use integrated rate laws — plot ln[A] vs t (linear = first order) or 1/[A] vs t (linear = second order).