Explore: All JEE Main chapters · JEE Main Chemistry PYQs · JEE Main hub · JEE Main 2026 · Syllabus & pattern
Answer first
Equilibrium PYQs (previous year questions) for JEE Main: Equilibrium (Chemistry) had 19 questions across the 11 official JEE Main papers we tagged (2016–2026), and appeared in 11 of them. Asked in 3 of 3 years. The concepts asked in the most papers: Equilibrium Constant, Solubility Product, Ionic Equilibrium.
Year-wise question count
Asked in 3 of 3 years.
| Year | Papers | Questions | Per paper |
|---|---|---|---|
| JEE Main 2026 | 9 | 16 | 1.8 |
| JEE Main 2017 | 1 | 1 | 1 |
| JEE Main 2016 | 1 | 2 | 2 |
Most-asked concepts
Sorted by the number of papers a concept appeared in.
| Concept | Questions | Papers | Years |
|---|---|---|---|
| Equilibrium Constant | 6 | 6 | 2026, 2016 |
| Buffer Solutions | 2 | 2 | 2026 |
| Ionic Equilibrium | 2 | 2 | 2026 |
| Solubility Product | 2 | 2 | 2026 |
| Adsorption Isotherm | 1 | 1 | 2016 |
| Gibbs Energy and Equilibrium | 1 | 1 | 2026 |
| pH and Buffers | 1 | 1 | 2026 |
| pH of Mixtures | 1 | 1 | 2026 |
| Salt Hydrolysis | 1 | 1 | 2017 |
| Simultaneous Equilibria | 1 | 1 | 2026 |
| Van't Hoff Equation | 1 | 1 | 2026 |
How to practise Equilibrium PYQs
- Start with the concepts at the top of the table. They have come back the most.
- Solve one year’s Equilibrium questions from the official PDF against the clock, then check the answer listed below.
- Log every miss as a concept gap, a calculation slip or a misread. Each needs a different fix.
- 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 Main2026
- Q.56 (2 April, shift 1) · MCQ · Solubility Product: Ratio of molar solubilities of Ag2CrO4 and AgBr from Ksp values (official answer: option 4) PDF
- Q.52 (2 April, shift 2) · MCQ · Ionic Equilibrium: Concentration of HA- for a dibasic acid dissolved in 0.1 M HCl (official answer: option 3) PDF
- Q.56 (2 April, shift 2) · MCQ · pH and Buffers: pH of weak acid before titration and at half-neutralisation (official answer: option 2) PDF
- Q.55 (4 April, shift 1) · MCQ · Equilibrium Constant: Equilibrium constant when a reaction is scaled by 1/3 (official answer: option 4) PDF
- Q.74 (4 April, shift 1) · Numerical · Buffer Solutions: pH of a mixture of NH4OH and NH4Cl solutions (official answer: 756) PDF
- Q.55 (4 April, shift 2) · MCQ · Buffer Solutions: pH of a solution of acetic acid half-neutralised by NaOH (official answer: option 2) PDF
- Q.72 (4 April, shift 2) · Numerical · Gibbs Energy and Equilibrium: Standard free energy change for 50% dissociation of N₂O₅ at 2 atm (official answer: 2474) PDF
- Q.55 (5 April, shift 1) · MCQ · Solubility Product: Ratio of anion concentration to Ksp for M₃A₂ (official answer: option 1) PDF
- Q.56 (5 April, shift 1) · MCQ · pH of Mixtures: Order of pH of three acid-base mixtures (official answer: option 3) PDF
- Q.74 (5 April, shift 1) · Numerical · Van't Hoff Equation: ΔH°/R from log Kp versus 1/T data (official answer: 230) PDF
- Q.56 (5 April, shift 2) · MCQ · Equilibrium Constant: Expression for Kp of A ⇌ B + C in terms of a, x and p (official answer: option 2) PDF
- Q.57 (6 April, shift 1) · MCQ · Equilibrium Constant: Partial pressures of He and B at equilibrium in closed flask (official answer: option 1) PDF
- Q.56 (6 April, shift 2) · MCQ · Ionic Equilibrium: Degree of dissociation of weak electrolyte AxBy in concentrated solution (official answer: option 2) PDF
- Q.74 (6 April, shift 2) · Numerical · Equilibrium Constant: Standard Gibbs energy from degree of dissociation of X2Y4 (official answer: 8) PDF
- Q.55 (8 April, shift 2) · MCQ · Equilibrium Constant: Combine two equilibria to obtain K for a third reaction (official answer: option 3) PDF
- Q.75 (8 April, shift 2) · Numerical · Simultaneous Equilibria: Partial pressure of CO from two coupled heterogeneous equilibria (official answer: 4) PDF
JEE Main2017
- Q.40 · MCQ · Salt Hydrolysis: pH of salt of a weak acid and weak base PDF
JEE Main2016
Equilibrium in other exams
The same chapter in other official papers we tagged: JEE Advanced (16 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 Main?
In the official papers we tagged: 16 in 2026 (9 papers), 1 in 2017 (1 paper) and 2 in 2016 (1 paper). That is 19 questions in all, about 7% of Chemistry.
Which Equilibrium topics repeat in JEE Main?
Asked in the most papers: Equilibrium Constant, Solubility Product, Ionic Equilibrium. The concept table lists every one with its count.
Are these official JEE Main questions?
Yes. Every question is from an official JEE Main paper hosted on our year pages. The one-line summaries are ours; open the PDF linked beside each question for the full text.