JEE Main 2026 — Chemical Equilibrium Question with Solution
JEE Main 2026 (23 January Shift 1)
Question
For the following gas phase equilibrium reaction at constant temperature,
if the total pressure is and the pressure equilibrium constant is 9 atm, then the degree of dissociation is given as . The value of is . (nearest integer)
if the total pressure is and the pressure equilibrium constant is 9 atm, then the degree of dissociation is given as . The value of is . (nearest integer)
Enter your answer
Show full solutionCorrect answer: 125
Correct answer
125
Step-by-step explanation
For the reaction:
At : 1 mole, –, –
At equilibrium: , ,
Total moles
Given atm and atm:
Simplifying:
So .
At : 1 mole, –, –
At equilibrium: , ,
Total moles
Given atm and atm:
Simplifying:
So .
Practice this on the real CBT interface
Solve this JEE Main question (and the rest of the Chemical Equilibrium chapter) on PrepSharp's TCS iON-style CBT player — with timer, bookmarks and session analytics.
Solve interactively →About this question
This is a previous-year question from JEE Main 2026, covering the Chemical Equilibrium chapter of Chemistry. PrepSharp catalogues every PYQ from JEE Main with a verified answer key and step-by-step solution prepared by IIT alumni — so you can search by chapter, topic or year and revise efficiently.