Consider the following gas phase reaction being carried out in a closed vessel at 25°C. $2A(g) \longrightarrow 4B(g) + C(g)$ | time (min) | total pressure of the system (mm Hg) | |---|---| | 30 | 300 | | $\infty$ | 600 | The pressure of C(g) at 30 minutes time interval would be __________ mm Hg. (nearest integer)

JEE Main 2026 · ChemistryNumerical answerNumerical valueMediumMulti-step

JEE Main 2 April 2026, Shift 2, Chemistry Q72

Question 72 of 75 in this shift, Chemistry question 22 of 25, Section B.

Consider the following gas phase reaction being carried out in a closed vessel at 25°C.

2A(g) \longrightarrow 4B(g) + C(g)

time (min)	total pressure of the system (mm Hg)
30	300
$\infty$	600

The pressure of C(g) at 30 minutes time interval would be __________ mm Hg. (nearest integer)

Official answer

NTA final key.

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

Same idea in other shifts

Asked 4× in all

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

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.