JEE Main 2024 · ChemistryNumerical answerNumerical valueMediumCalculation

JEE Main 1 February 2024, Shift 2, Chemistry Q86

Question 86 of 90 in this shift, Chemistry question 26 of 30, Section B.

The following data were obtained during the first order thermal decomposition of a gas A at constant volume :

\mathrm{A(g) \rightarrow 2B(g) + C(g)}

S.No. | Time/s | Total pressure/(atm) 1. | 0 | 0.1 2. | 115 | 0.28 The rate constant of the reaction is ________

\times 10^{-2}\ \mathrm{s^{-1}}

(nearest integer)

Official answer

NTA final key.

Chapter: Chemical Kinetics
Topic: Integrated Rate Equations
Idea tested: Gas Kinetics with Complex Stoichiometry

Same idea in other shifts

Asked 6× in all

2 Apr 2026, Shift 2 · Q72Consider the following gas phase reaction being carried out in a closed vessel at 25°C. $2A(g) \longrightarrow 4B(g) + C(g)$ | time (min)…MediumNumerical value
7 Apr 2025, Shift 1 · Q56Reaction $\mathrm{A(g) \rightarrow 2B(g) + C(g)}$ is a first order reaction. It was started with pure A t/min | Pressure of system at time…MediumOtherHas a figure
31 Jan 2024, Shift 1 · Q65Integrated rate law equation for a first order gas phase reaction is given by (where $\mathrm{P_i}$ is initial pressure and $\mathrm{P_t}$ …MediumSingle correct
13 Apr 2023, Shift 2 · Q87 $\mathrm{A(g)\rightarrow 2B(g)+C(g)}$ is a first order reaction. The initial pressure of the system was found to be 800 mm Hg which…MediumNumerical value
4 Aug 2021, Shift 2 · Q59 $\mathrm{N_2O_5}$ decomposes following first order kinetics according to the reaction…HardNumerical value

Question text from the official JEE Main paper published by NTA; answer from the final answer key. Chapter, topic and idea tags, difficulty and skill are Lumi’s. Lumi analyses 108 of the 174 JEE Main shifts held from 2017 to 2026.