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Chemical Thermodynamics PYQs (previous year questions) for JEE Main: Chemical Thermodynamics (Chemistry) had 14 questions across the 11 official JEE Main papers we tagged (2016–2026), and appeared in 10 of them. Asked in 3 of 3 years. The concepts asked in the most papers: Hess’s Law, Gibbs Energy, Heat Capacity.
Year-wise question count
Asked in 3 of 3 years.
| Year | Papers | Questions | Per paper |
|---|---|---|---|
| JEE Main 2026 | 9 | 11 | 1.2 |
| JEE Main 2017 | 1 | 2 | 2 |
| JEE Main 2016 | 1 | 1 | 1 |
Most-asked concepts
Sorted by the number of papers a concept appeared in.
| Concept | Questions | Papers | Years |
|---|---|---|---|
| Hess's Law | 3 | 3 | 2026, 2017, 2016 |
| Gibbs Energy | 2 | 2 | 2026 |
| Heat Capacity | 2 | 2 | 2026 |
| Enthalpy of Formation | 1 | 1 | 2026 |
| Enthalpy of Reaction | 1 | 1 | 2026 |
| First Law | 1 | 1 | 2017 |
| First Law of Thermodynamics | 1 | 1 | 2026 |
| Gibbs Energy and Equilibrium | 1 | 1 | 2026 |
| Isothermal Processes | 1 | 1 | 2026 |
| Work in Isothermal Processes | 1 | 1 | 2026 |
How to practise Chemical Thermodynamics PYQs
- Start with the concepts at the top of the table. They have come back the most.
- Solve one year’s Chemical Thermodynamics 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.54 (2 April, shift 1) · MCQ · Hess's Law: Enthalpy of formation of anhydrous Al2Cl6 from given reaction data (official answer: option 4) PDF
- Q.75 (2 April, shift 1) · Numerical · Gibbs Energy: Transition temperature where Delta G = 105 - 35 log T is zero (official answer: 727) PDF
- Q.54 (2 April, shift 2) · MCQ · First Law of Thermodynamics: Work in the reverse step of a cyclic process from heat and work data (official answer: option 4) PDF
- Q.54 (4 April, shift 1) · MCQ · Heat Capacity: Statements on Cv versus Cp and heat in constant volume process (official answer: option 4) PDF
- Q.71 (4 April, shift 2) · Numerical · Enthalpy of Formation: Enthalpy of formation of ethanol from bomb calorimeter data (official answer: 3) PDF
- Q.54 (5 April, shift 2) · MCQ · Gibbs Energy: ΔG° of X₂+Y₂ → 2XY at 600 K from ΔH and S data (official answer: option 2) PDF
- Q.55 (5 April, shift 2) · MCQ · Heat Capacity: Order of molar heat capacities of copper, bromine and helium (official answer: option 2) PDF
- Q.55 (6 April, shift 1) · MCQ · Work in Isothermal Processes: Order magnitudes of work for single and multistage expansion/compression (official answer: option 3) PDF
- Q.75 (6 April, shift 1) · Numerical · Gibbs Energy and Equilibrium: Find standard entropy change from enthalpy change and K (official answer: 34) PDF
- Q.54 (6 April, shift 2) · MCQ · Isothermal Processes: Match isothermal process types with q and w expressions (official answer: option 3) PDF
- Q.74 (8 April, shift 2) · Numerical · Enthalpy of Reaction: Enthalpy change of H2S combustion from enthalpies of formation (official answer: 1126) PDF
JEE Main2017
JEE Main2016
- Q.35 · MCQ · Hess's Law: Heat of formation of CO from combustion enthalpies PDF
Chemical Thermodynamics in other exams
The same chapter in other official papers we tagged: JEE Advanced (23 questions), NEET (3 questions).
Other Chemistry chapters
- Some Basic Concepts in Chemistry PYQs
- Atomic Structure PYQs
- Chemical Bonding and Molecular Structure PYQs
- Solutions PYQs
- Equilibrium 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 Chemical Thermodynamics questions come in JEE Main?
In the official papers we tagged: 11 in 2026 (9 papers), 2 in 2017 (1 paper) and 1 in 2016 (1 paper). That is 14 questions in all, about 5% of Chemistry.
Which Chemical Thermodynamics topics repeat in JEE Main?
Asked in the most papers: Hess’s Law, Gibbs Energy, Heat Capacity. 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.