Chemical Kinetics And Nuclear Chemistry — JEE Main Previous Year Questions

How many JEE Main questions come from Chemical Kinetics And Nuclear Chemistry?

Chemical Kinetics And Nuclear Chemistry has contributed 186 questions to Joint Entrance Examination (Main) papers between 2016 and 2026 — an average of about 17 questions a year. That count is measured from EByAi’s bank of 55,289 JEE Main questions, not estimated from a syllabus. Every one of the 186 questions carries a written, step-by-step solution, and each is tagged to Chemical Kinetics And Nuclear Chemistry within Chemistry, so you can drill this chapter across every year at once instead of hunting through paper PDFs. Practising a chapter’s full PYQ history is the fastest way to learn the patterns examiners reuse.

Sample Chemical Kinetics And Nuclear Chemistry questions from real JEE Main papers

These are 5 real questions from the bank — exactly as asked, with the answer one tap away. All 186 Chemical Kinetics And Nuclear Chemistry questions (with full written solutions) are available in practice.

1. Question 1 · JEE Main 2026

   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 of A(g) is allowed to decompose at T(K). After 100 min, the total pressure was 1.5 bar. What is the rate constant (in min −1 ) of the reaction? (log 2 = 0.3)
   1. (A)$6.9\times 10^{-4}$
   2. (B)$6.9\times 10^{-3}$
   3. (C)$6.9\times 10^{-1}$
   4. (D)$6.9\times 10^{-2}$
   Show answerAnswer

   Answer: (B) $6.9\times 10^{-3}$

2. Question 2 · JEE Main 2026

   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 correctly represents the relation between t 100% and t 1/2 for zero and first order reactions respectively?
   1. (A)$t_{100\%}=(t_{1/2}{)}^2$ and $t_{100\%}=(t_{1/2}{)}^{-\infty }$
   2. (B)$t_{100\%}=2t_{1/2}$ and $t_{100\%}=(t_{1/2}{)}^{\infty }$
   3. (C)$t_{100\%}=2t_{1/2}$ and $t_{100\%}=(2t_{1/2}{)}^2$
   4. (D)$t_{100\%}=(t_{1/2}{)}^{\infty }$ and $t_{100\%}=2t_{1/2}$
   Show answerAnswer

   Answer: (B) $t_{100\%}=2t_{1/2}$ and $t_{100\%}=(t_{1/2}{)}^{\infty }$

3. Question 3 · JEE Main 2022

   For a first order reaction, the time required for completion of 90% reaction is 'x' times the half life of the reaction. The value of 'x' is (Given : ln 10 = 2.303 and log 2 = 0.3010)
   1. (A)1.12
   2. (B)2.43
   3. (C)3.32
   4. (D)33.31
   Show answerAnswer

   Answer: (C) 3.32

4. Question 4 · JEE Main 2021

   For a reaction of order n, the unit of the rate constant is :
   1. (A)mol 1$-$n L 1$-$n s
   2. (B)mol 1$-$n L 2n s $-$1
   3. (C)mol 1$-$n L n$-$1 s $-$1
   4. (D)mol 1$-$n L 1$-$n s $-$1
   Show answerAnswer

   Answer: (C) mol 1$-$n L n$-$1 s $-$1

5. Question 5 · JEE Main 2020

   The rate of a certain biochemical reaction at physiological temperature (T) occurs 10^6 times faster with enzyme than without. The change in the activation energy upon adding enzyme is :
   1. (A)+ 6RT
   2. (B)– 6 (2.303)RT
   3. (C)– 6RT
   4. (D)+ 6(2.303)RT
   Show answerAnswer

   Answer: (B) – 6 (2.303)RT

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