Chemical and Ionic Equilibrium has a 6–8% weightage in JEE Advanced 2025 Chemistry syllabus and is regarded as moderate to hard in conceptual depth. Major concepts such as Law of Chemical Equilibrium, Le Chatelier's Principle, Ionic Product, Solubility Product, and pH calculations are asked repeatedly in JEE Advanced question papers, so this chapter is must- revise for good exam performance.

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Most important Topics for JEE Advanced 2025 (Chemical and Ionic Equilibrium):

Based on the JEE Advanced previous year paper trends, the following are the high-weightage topics in JEE Advanced 2025:

  • Law of Chemical Equilibrium & Equilibrium Constant (JEE Advanced 2023, Paper 1)
  • Le Chatelier's Principle & Shifts in Equilibrium (JEE Advanced 2021, Paper 2)
  • Ionic Equilibrium in Acids and Bases (JEE Advanced 2020, Paper 1)
  • Solubility Product (Ksp) & Common Ion Effect (JEE Advanced 2019, Paper 2)
  • pH Calculations & Buffer Solutions (JEE Advanced 2018, Paper 1)
  • Relation Between Kc, Kp, and ΔG (JEE Advanced 2017, Paper 2)

JEE Advanced previous year question papers and mock tests can assist IIT Aspirants to achieve higher rankings in JEE Advanced 2025.

Listed below the most repeated questions JEE Advanced Previous Year Questions (PYQs) for Chemical and Ionic Equilibrium along with detailed solutions
 

1. In a conductometric titration, small volume of titrant of higher concentration is added stepwise to a larger volume of titrate of much lower concentration, and the conductance is measured after each addition. The limiting ionic conductivity (Λ0) values (in mS m2mol-1) for different ions in aqueous solutions are given below:
Ion Λ0 (mS m2mol-1)
Ag+ 6.2
K+ 7.4
Na+ 5.0
H+ 35.0
NO3- 7.2
Cl- 7.6
SO42- 16.0
OH- 19.9
CH3COO- 4.1
For different combinations of titrates and titrants given in List-I, the graphs of 'conductance' versus 'volume of titrant' are given in List-II. Match each entry in List-I with the appropriate entry in List-II and choose the correct option.
JEE Advanced 2024 JEE Advanced
A P-4, Q-3, R-2, S-5
B P-2, Q-4, R-3, S-1
C P-3, Q-4, R-2, S-5
D P-4, Q-3, R-2, S-1
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2. Vessel-1 contains w2 g of a non-volatile solute X dissolved in w1 g of water. Vessel-2 contains w2 g of another non-volatile solute Y dissolved in w1 g of water. Both vessels are at the same temperature and pressure. The molar mass of X is 1.2 times that of Y. The van’t Hoff factor for X is 1.2 times that of Y for their respective concentrations. The elevation of boiling point for solution in Vessel-1 is _____ % of the solution in Vessel-2.
JEE Advanced 2024 JEE Advanced

View Solution
3. The boiling point of water in a 0.1 molal silver nitrate solution (solution A) is x0C. To this solution A, an equal volume of 0.1 mol aqueous barium chloride solution is added to make a new solution B. The difference in the boiling points of water in the two solutions A and B is y x 10-2°C. (Assume: Densities of the solutions A and B are the same as that of water and the soluble salts dissociate completely. Use: Molar elevation constant (Ebullioscopic Constant), Kb = 05 K kg mol-1; Boiling point of pure water at 100°C). The value of x is ______°C.
JEE Advanced 2024 JEE Advanced

View Solution
4. Concentration of H2SO4 and Na2SO4 in a solution is 1M and 1.8 × 10-2M, respectively. Molar solubility of PbSO4 in the same solution is X × 10-YM (expressed in scientific notation). The value of Y is ______. [Given: Solubility product of PbSO4 (Ksp) = 1.6 × 10-8. For H2SO4, Ka1 is very large and [Ka2 = 1.2 × 10-2]
JEE Advanced 2024 JEE Advanced

View Solution
5. A colorless aqueous solution contains nitrates of two metals, X and Y. When it was added to an aqueous solution of NaCl, a white precipitate was formed. This precipitate was found to be partly soluble in hot water to give a residue P and a solution Q. The residue P was soluble in aq NH3 and also in excess sodium thiosulfate. The hot solution Q gave a yellow precipitate with KI. The metals X and Y, respectively, are
JEE Advanced 2024 JEE Advanced
A Ag and Pb
B Ag and Cd
C Cd and Pb
D Cd and Zn
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JEE Advanced 2025 Chapter-Wise Weightage For Chemistry

Chapter Name Approx. Weightage (%) No. of Expected Questions
Chemical Thermodynamics 6–8% 2
Atomic Structure 5% 1–2
Chemical Bonding & Molecular Structure 6–7% 2
Equilibrium (Ionic + Chemical) 7–9% 2–3
Electrochemistry 5–6% 1–2
Solutions & Colligative Properties 4–5% 1–2
Redox Reactions 3% 1
Surface Chemistry 3% 1
Solid State 3–4% 1
Kinetics 5–6% 1–2
Organic Chemistry (General + Named Reactions) 12–14% 4–5
Biomolecules, Polymers, Chemistry in Everyday Life 4–5% 1–2
Coordination Compounds 6–7% 2
The d- and f-Block Elements 5% 1–2
Qualitative Inorganic Analysis 4% 1

JEE Advanced 2025 Difficulty Analysis For Chemistry

Chapter Name Difficulty Level (Easy / Moderate / Hard)
Chemical Thermodynamics Moderate to Hard
Atomic Structure Moderate
Chemical Bonding Moderate
Equilibrium Hard
Electrochemistry Hard
Solutions Moderate
Redox Reactions Easy
Surface Chemistry Easy
Solid State Moderate
Chemical Kinetics Moderate
Organic Chemistry (Full) Moderate to Hard
Biomolecules & Polymers Easy
Coordination Compounds Hard
d- and f-Block Elements Moderate
Inorganic Qualitative Analysis Hard

Download Last 10 years JEE Advanced Previous Year Question Papers (2024 - 2016)

IIIT JEE Advanced Previous Year Question Papers

You can download free IIT JEE Advanced Previous Year Question Paper PDFs from the table provided below:-

JEE Advanced Paper Name Question Paper Link
JEE Advanced 2024 Question Paper PDF Click Here
JEE Advanced 2023 Question Paper PDF Click Here
JEE Advanced 2022 Question Paper PDF Click Here
JEE Advanced 2021 Question Paper PDF Click Here
JEE Advanced 2020 Question Paper PDF Click Here
JEE Advanced 2019 Question Paper PDF Click Here
JEE Advanced 2018 Question Paper PDF Click Here
JEE Advanced 2017 Question Paper PDF Click Here
JEE Advanced 2016 Question Paper PDF Click Here

Frequently Asked Questions:-

1. Is ionic equilibrium important for JEE Advanced?

Yes, Ionic Equilibrium is an important topic for JEE Advanced under Physical Chemistry section and questions from acid-base equilibria, solubility product (Ksp), and the common ion effect are frequently asked in the exam. Mastering this subject will assist you in solving numerical problems as well as theoretical questions, and thus it is important for good marks.

2. Which is the most scoring subject in JEE Advanced?

Most scoring subject in JEE Advanced may differ from person to person based on strengths, but most of the time Chemistry is one of the most scoring subjects. Topics of Physical Chemistry like Chemical and Ionic Equilibrium, Thermodynamics, and Electrochemistry have heavy weightage. These are all concept-based subjects, so with frequent practice, it is easy for students to get good marks.

3. What should I study first chemical equilibrium or ionic equilibrium?

It is advisable to start with Chemical Equilibrium since it is related Ionic Equilibrium. Both the topics are interlinked, and if you are familiar with Le Chatelier's Principle and the Equilibrium Constant of Chemical Equilibrium, you would be able to grasp concepts such as acid-base equilibrium and solubility product more comfortably in Ionic Equilibrium. But Ionic Equilibrium tends to carry a marginally greater weightage, so ensure that you provide it due attention once you have mastered Chemical Equilibrium fundamentals.

4. Is ionic equilibrium a tough chapter?

Ionic Equilibrium is challenging for certain students because of its conceptual complexity and mathematical treatment. But with practice, it becomes simpler. Understanding the concepts well, such as pH calculations, the common ion effect, and solubility product (Ksp) can help. With regular practice and a good understanding of how to use formulas, Ionic Equilibrium can be one of the more comfortable topics of Physical Chemistry.