Equilibrium JEE Advanced PYQ Chapter Wise (2016–2026)

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Answer first

Equilibrium PYQs (previous year questions) for JEE Advanced: Equilibrium (Chemistry) had 16 questions across the 22 official JEE Advanced papers we tagged (2016–2026), and appeared in 12 of them. Asked in 8 of 11 years; last in 2025. The concepts asked in the most papers: Solubility Product, Equilibrium Constant, Ionic Equilibrium.

Year-wise question count

Asked in 8 of 11 years, with 2 papers each year.

Most-asked concepts

Sorted by the number of papers a concept appeared in.

How to practise Equilibrium PYQs

1. Start with the concepts at the top of the table. They have come back the most.
2. Solve one year’s Equilibrium questions from the official PDF against the clock, then check the answer listed below.
3. Log every miss as a concept gap, a calculation slip or a misread. Each needs a different fix.
4. Once a concept is clean in two papers, move to the next. Then sit a full paper from the year pages.

Questions by year

Each line gives the question number and paper, type, concept, our one-line summary and the official answer, with a link to the official PDF.

JEE Advanced2025

• Q.9 (Paper 1) · Numerical · Ionic Equilibrium: H+ concentration in a very weak acid solution including water ionisation (official answer: 2.2–2.3) PDF
• Q.10 (Paper 2) · Numerical · Solubility Product: Solubility of barium iodate after mixing two salt solutions (official answer: 3.85–4.15) PDF

JEE Advanced2023

• Q.6 (Paper 1) · MCQ · Solubility Product: pKa of HX from change in solubility of MX with pH (official answer: B) PDF
• Q.12 (Paper 1) · Integer · Equilibrium Constant: Relate standard Gibbs energies from equilibrium yields at two temperatures (official answer: 8) PDF

JEE Advanced2022

• Q.3 (Paper 1) · Numerical · pH Calculation: pH of a mixture of carbonic acid, its salts and NaOH (official answer: 10.00–10.04) PDF
• Q.1 (Paper 2) · Integer · Solubility Product: Molar solubility of PbSO4 with common ions and given Ka2 (official answer: 6) PDF

JEE Advanced2020

• Q.14 (Paper 1) · Numerical · Equilibrium and Gibbs Energy: Ratio of standard Gibbs energies at two temperatures from a plot PDF
• Q.13 (Paper 2) · Numerical · Acid-Base Titration: pKb of a weak base from a titration curve PDF
• Q.18 (Paper 2) · Numerical · Solubility Product: Minimum H+ needed to prevent ZnS precipitation PDF

JEE Advanced2019

• Q.15 (Paper 1) · Numerical · Equilibrium Constant: Equilibrium Fe2+ concentration after FeS precipitation (official answer: 8.70–9.10) PDF

JEE Advanced2018

• Q.13 (Paper 1) · Numerical · Solubility Product: Solubility of a weak-acid salt at a given pH PDF
• Q.6 (Paper 2) · MSQ · Temperature and K: Signs of enthalpy and entropy from concentration-time plots PDF
• Q.18 (Paper 2) · Matching · Ionic Equilibrium: Match dilution of solutions with effect on [H+] PDF

JEE Advanced2017

• Q.27 (Paper 2) · MSQ · Temperature and K: Effect of temperature on K explained via entropy changes (official answer: B, D) PDF

JEE Advanced2016

• Q.33 (Paper 2) · Paragraph MCQ · Equilibrium Constant: Kp in terms of extent of dissociation of X2 (official answer: B) PDF
• Q.34 (Paper 2) · Paragraph MCQ · Le Chatelier's Principle: Incorrect statement about a gas dissociation equilibrium (official answer: C) PDF

Equilibrium in other exams

The same chapter in other official papers we tagged: JEE Main (19 questions), NEET (2 questions).

Other Chemistry chapters

• Some Basic Concepts in Chemistry PYQs
• Atomic Structure PYQs
• Chemical Bonding and Molecular Structure PYQs
• Chemical Thermodynamics PYQs
• Solutions PYQs
• Redox Reactions and Electrochemistry PYQs
• Chemical Kinetics PYQs
• Classification of Elements and Periodicity PYQs
• p-Block Elements PYQs
• d- and f-Block Elements PYQs
• Coordination Compounds PYQs
• Purification and Characterisation of Organic Compounds PYQs
• Some Basic Principles of Organic Chemistry PYQs
• Hydrocarbons PYQs
• Organic Compounds Containing Halogens PYQs
• Organic Compounds Containing Oxygen PYQs
• Organic Compounds Containing Nitrogen PYQs
• Biomolecules PYQs
• Principles Related to Practical Chemistry PYQs

FAQ

How many Equilibrium questions come in JEE Advanced?

In the official papers we tagged: 2 in 2025, 2 in 2023, 2 in 2022, 3 in 2020, 1 in 2019, 3 in 2018, 1 in 2017 and 2 in 2016 (2 papers each year). Not asked in the other 3 years. That is 16 questions in all, about 4% of Chemistry.

Which Equilibrium topics repeat in JEE Advanced?

Asked in the most papers: Solubility Product, Equilibrium Constant, Ionic Equilibrium. The concept table lists every one with its count.

Are these official JEE Advanced questions?

Yes. Every question is from an official JEE Advanced paper hosted on our year pages. The one-line summaries are ours; open the PDF linked beside each question for the full text.