Chemical Thermodynamics 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 the First and Second Laws, Enthalpy, Entropy, Gibbs Free Energy, and Spontaneity are asked repeatedly in JEE Advanced question papers, so this chapter is must- revise for good exam performance.
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- Download JEE Advanced Last 10 year PYQ for Free
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Most important Topics for JEE Advanced 2025 (Chemical Thermodynamics):
Based on the JEE Advanced previous year paper trends, the following are the high-weightage topics in JEE Advanced 2025:
- First Law of Thermodynamics & Internal Energy (JEE Advanced 2023, Paper 1)
- Enthalpy Changes in Chemical Reactions (JEE Advanced 2021, Paper 2)
- Entropy & Second Law of Thermodynamics (JEE Advanced 2020, Paper 1)
- Gibbs Free Energy & Spontaneity of Reactions (JEE Advanced 2019, Paper 2)
- Hess’s Law & Standard Enthalpy Changes (JEE Advanced 2018, Paper 1)
- Relation Between ΔG, K, and E° (Electrochemistry Linkage) (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 Thermodynamics along with detailed solutions
A → B is an adiabatic process. If the total heat absorbed in the entire process (A → B and B → C) is RT2 ln 10, the value of 2 log V3 is ___. [Use molar heat capacity of the gas at constant pressure, Cp,m = (5/2) R]
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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 thermodynamics important for JEE Advanced?
Yes! Thermodynamics is a topic of high weightage in both Physics and Chemistry in JEE Advanced 2025. It is regularly tested in both numerical and conceptual forms.
Why is it important?
- In Physics, questions are from First Law of Thermodynamics, Carnot Cycle, and Entropy.
- In Chemistry, questions are on Gibbs Free Energy, Enthalpy, and Spontaneity of Reactions.
Trend: 3-4 questions (10-12 marks) are asked annually from Thermodynamics, so it is an easy-scoring topic if concepts are clear.
2. Is chemical thermodynamics hard?
Not at all! Chemical Thermodynamics is a concept-based subject, and if you get the formulas and their uses clear, it's easy.
Why do students think it's tricky?
Mix-up of Enthalpy (ΔH), Entropy (ΔS), and Gibbs Free Energy (ΔG).
Need to use Mathematical Formulas properly in problems.
Ideal strategy to Score High:
- Pay attention to NCERT concepts because JEE has a tendency to provide direct formula-based questions.
- Solve PYQs (Previous Year Questions) to recognize repetitive patterns.
3. Is thermodynamics closer to physics or chemistry?
Thermodynamics is common to both Physics and Chemistry, but the focus is different:
In Physics: It includes Heat, Work, Laws of Thermodynamics, and Engines.
In Chemistry: It involves Energy Changes in Reactions, Spontaneity, and Equilibrium.
JEE Advanced Trend:
- In Physics, Thermodynamics is generally connected with Heat Transfer & Kinetic Theory of Gases.
- In Chemistry, it's connected with Equilibrium and Electrochemistry.
Tip: If you're well-prepared for Physics Thermodynamics, Chemistry Thermodynamics is much easier!
4. What rank is 100 marks in JEE Advanced?
100 marks rank in JEE Advanced 2025 is based on the difficulty of the exam and cutoff trends.
Expected Rank (Based on Last Year Trends)
100-110 marks → 15,000 - 18,000 rank
120-130 marks → 10,000 - 12,000 rank
150+ marks → Less than 5,000 rank
Note: The rank is updated annually, so use maximum accuracy with no negative marking.
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