JEE Main 2022ChemistryThermodynamics (C)HardNumerical

JEE Main 2022 — Thermodynamics (C) Question with Solution

JEE Main 2022 (26 Jun Shift 2)

Question

40% of HI undergoes decomposition to H2 and I2 at 300 K.ΔGΘ for this decompostion reaction at one atmopsphere pressure is____Jmol-1-[nearest integer]

Use R=8.31JK-1 mol-1;log2=0.3010,ln10=2.3,log3=0.477

Enter your answer

Show full solutionCorrect answer: 2735
Correct answer
2735

Step-by-step explanation

HIg⇌12H2g+12I2g

Initial moles 1 0 0
moles at equilibrium 1-0.4 0.2 0.2

KP=0.212×0.2120.6

KP=0.20.6=13

ΔG°=-2.3RTlogKP

=-2.3×8.31×300log13

=2375Jmol-1

Practice this on the real CBT interface

Solve this JEE Main question (and the rest of the Thermodynamics (C) 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 2022, covering the Thermodynamics (C) 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.