JEE Main 2023 · ChemistryNumerical answerNumerical valueMediumCalculation

JEE Main 13 April 2023, Shift 2, Chemistry Q87

Question 87 of 90 in this shift, Chemistry question 27 of 30, Section B.

\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 increased to 1600 mm Hg after 10 min. The total pressure of the system after 30 min will be ______ mm Hg. (Nearest integer)

Official answer

2200

NTA final key.

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

Same idea in other shifts

Asked 4× 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

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 42 of the 174 JEE Main shifts held from 2017 to 2026.