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JEE Main Chemical Equilibrium questions with solutions

Equilibrium constants Kc and Kp, Le Chatelier principle and equilibrium calculations. 10 questions from our 2016–2025 JEE Main pattern papers, from the Class 11 Chemistry syllabus. Each has the answer and a full solution.

Also practise: Chemical Equilibrium for JEE Advanced

JEE Main 2025

Gaseous N2O4 at a total pressure of 2 atm and a fixed temperature has an equilibrium vapour density of 34.5 (the vapour density of undissociated N2O4…JEE Main 2025 · medium

JEE Main 2024

In a closed 1.0 L vessel at a fixed temperature, 1.0 mol H2, 1.0 mol I2 and 2.0 mol HI are mixed. For H2(g)+I2(g)rightleftharpoons 2HI(g), Kc=50. The…JEE Main 2024 · medium

JEE Main 2023

N2O4(g)rightleftharpoons 2NO2(g) is 20% dissociated at a total pressure of 1 atm at a fixed temperature. At what total pressure (same temperature)…JEE Main 2023 · medium

JEE Main 2022

The vapour density of N2O4 (taken before any dissociation) is 46. At 1 atm total pressure the equilibrium mixture N2O4(g)rightleftharpoons 2NO2(g)…JEE Main 2022 · medium

JEE Main 2021

Gaseous PCl5 dissociates as PCl5rightleftharpoonsPCl3+Cl2 with Kp=0.50 atm at a certain temperature. When the equilibrium total pressure is 2.0 atm…JEE Main 2021 · medium

JEE Main 2020

For PCl5(g)rightleftharpoons PCl3(g)+Cl2(g), the degree of dissociation is 0.40 at an equilibrium total pressure of 2 atm (temperature constant). The…JEE Main 2020 · medium

JEE Main 2019

N2O4(g) rightleftharpoons 2NO2(g) is 20% dissociated at a total pressure of 1 atm at a fixed temperature. If the total pressure is lowered to 0.25…JEE Main 2019 · medium

JEE Main 2018

PCl5(g)rightleftharpoons PCl3(g)+Cl2(g) is 40% dissociated at an equilibrium total pressure of 1 atm. If the total pressure of an equilibrium mixture…JEE Main 2018 · medium

JEE Main 2017

60 g of CaCO3 is heated in a rigid evacuated 41 L vessel at 1000 K until equilibrium CaCO3(s)rightleftharpoons CaO(s)+CO2(g) with Kp=0.50 atm is…JEE Main 2017 · medium

JEE Main 2016

00 mol of H2 and 2.00 mol of I2 are heated in a 1.00 L closed vessel until H2(g)+I2(g)rightleftharpoons2HI(g) reaches equilibrium, where Kc=50. The…JEE Main 2016 · medium

Other Chemistry topics

Alcohols, Phenols, Ethers and Haloalkanes 16 Atomic Structure 12 Biomolecules and Polymers 14 Carbonyl Compounds, Carboxylic Acids and Amines 25 Chemical Bonding and Molecular Structure 14 Chemical Kinetics 13 Chemical Thermodynamics 16 Coordination Compounds 18 Electrochemistry 18 General Organic Chemistry and Isomerism 13 Hydrocarbons 16 Ionic Equilibrium 11 Mole Concept and Stoichiometry 12 Periodic Properties 9 Qualitative and Practical Chemistry 8 Redox Reactions and Titrations 9 Solutions, Solid State and Surface Chemistry 19 d- and f-Block Elements and Metallurgy 14 s-Block, p-Block Elements and Hydrogen 23