JEE Main 2021 · ChemistryNumerical answerNumerical valueMediumCalculation

JEE Main 24 February 2021, Shift 1, Chemistry Q54

Question 54 of 90 in this shift, Chemistry question 24 of 30, Section B.

For the reaction

\mathrm{A_{(g)} \rightarrow B_{(g)}}

, the value of the equilibrium constant at 300 K and 1 atm is equal to 100.0. The value of

\Delta_r G

for the reaction at 300 K and 1 atm in

\mathrm{J\ mol^{-1}}

-x\mathrm{R}

, where

x

is __________. (Rounded off to the nearest integer) [R=8.31

\mathrm{J\ mol^{-1}K^{-1}}

and ln 10=2.3)

Official answer

1380

NTA final key.

Chapter: Equilibrium
Topic: Gibbs Free Energy
Idea tested: Delta G vs Delta G-degree at Equilibrium

Same topic in other shifts

All Gibbs Free Energy questions

2 Apr 2026, Shift 1 · Q75At the transition temperature $T$ , $\mathrm{A\rightleftharpoons B}$ and $\Delta G^0=105-35\log T$ where A and B are two states of…MediumNumerical value
2 Apr 2026, Shift 2 · Q73Consider the following two half-cell reactions along with the standard reduction potential given:…HardNumerical value
4 Apr 2026, Shift 2 · Q72For the following reaction at 50 $^\circ$ C and at 2 atm pressure, $\mathrm{2N_2O_5(g)\rightleftharpoons2N_2O_4(g)+O_2(g)}$ …HardNumerical value
5 Apr 2026, Shift 2 · Q54Consider the following data for the reaction $\mathrm{X_2(g)+Y_2(g)\rightleftharpoons 2XY(g)}$ at 600 K. The $\Delta_r G^\ominus$ (in kJ…MediumSingle correct
6 Apr 2026, Shift 1 · Q75Consider the reaction $\mathrm{X\rightleftharpoons Y}$ at 300 K. If $\Delta H^\theta$ and K are 28.40 kJ mol $^{-1}$ and $1.8\times10^{-7}$ …MediumNumerical value
2 Apr 2025, Shift 2 · Q54Which of the following graphs correctly represents the variation of thermodynamic properties of Haber's process ?HardDiagram basedHas a figure

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.