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JEE Advanced Chemical Equilibrium questions with solutions

Equilibrium constants Kc and Kp, Le Chatelier principle and equilibrium calculations. 13 questions from our 2016–2025 JEE Advanced pattern papers, from the Class 11 Chemistry syllabus. Each has the answer and a full solution.

Also practise: Chemical Equilibrium for JEE Main

JEE Advanced 2025

One mole of N2O4(g) is allowed to reach the equilibrium N2O4(g)rightleftharpoons 2NO2(g) at a fixed temperature. At equilibrium the total pressure is…JEE Advanced 2025 Paper 1 · medium
N2O4(g)rightleftharpoons 2NO2(g) is studied in a rigid vessel at constant temperature. When 1 mol of N2O4 is introduced so that the initial pressure…JEE Advanced 2025 Paper 2 · medium

JEE Advanced 2024

For the gas-phase equilibrium N2O4(g)rightleftharpoons 2NO2(g), the degree of dissociation of N2O4 is 0.20 at 300 K and total pressure 1.0 atm, and…JEE Advanced 2024 Paper 2 · medium

JEE Advanced 2023

For the equilibrium N2O4(g)rightleftharpoons 2NO2(g), Kp=0.15 atm at 298 K and Δ H^°=+57.2 kJ mol^-1 (assumed independent of temperature). Take…JEE Advanced 2023 Paper 1 · medium

JEE Advanced 2021

Paragraph 2: Dinitrogen tetroxide dissociates according to N2O4(g)rightleftharpoons2NO2(g). Exactly 1.00 mol of N2O4 is introduced into an evacuated…JEE Advanced 2021 Paper 1 · 2-question set

JEE Advanced 2020

For the gaseous equilibrium PCl5(g)rightleftharpoons PCl3(g)+Cl2(g) the value of Kp at a certain temperature is 1.0 atm. Pure PCl5 is allowed to…JEE Advanced 2020 Paper 2 · easy

JEE Advanced 2018

For the gas-phase equilibrium A(g)rightleftharpoons 2B(g) at a fixed temperature, Kp = 0.50 atm. Starting with pure A, the degree of dissociation at…JEE Advanced 2018 Paper 1 · hard
One mole of A(g) is allowed to dissociate as A(g)rightleftharpoons 2B(g) at 400 K and constant total pressure. The equilibrium constant is Kp=0.50…JEE Advanced 2018 Paper 2 · hard

JEE Advanced 2017

At 330 K and a total pressure of 1.00 atm, an equilibrium mixture of N2O4(g)rightleftharpoons 2NO2(g) has an average molar mass of 69.0 g mol^-1…JEE Advanced 2017 Paper 1 · medium
For the gas-phase equilibrium N2O4(g)rightleftharpoons 2NO2(g) the standard Gibbs energy change at 298 K is Δ G^°=+5.4 kJ mol^-1 (standard pressure 1…JEE Advanced 2017 Paper 2 · medium

JEE Advanced 2016

For PCl5(g)rightleftharpoonsPCl3(g)+Cl2(g), pure PCl5 is found to be 50% dissociated at equilibrium at 500 K when the total pressure is 1.0 atm. Take…JEE Advanced 2016 Paper 1 · medium
One mole of PCl5(g) is introduced into a vessel fitted with a frictionless movable piston at 500 K and allowed to reach equilibrium…JEE Advanced 2016 Paper 2 · hard

Other Chemistry topics

Alcohols, Phenols, Ethers and Haloalkanes 11 Atomic Structure 9 Biomolecules and Polymers 8 Carbonyl Compounds, Carboxylic Acids and Amines 20 Chemical Bonding and Molecular Structure 17 Chemical Kinetics 24 Chemical Thermodynamics 21 Coordination Compounds 23 Electrochemistry 22 General Organic Chemistry and Isomerism 37 Hydrocarbons 12 Ionic Equilibrium 20 Mole Concept and Stoichiometry 6 Qualitative and Practical Chemistry 7 Redox Reactions and Titrations 15 Solutions, Solid State and Surface Chemistry 26 d- and f-Block Elements and Metallurgy 11 s-Block, p-Block Elements and Hydrogen 29