JEE Main Chemical Thermodynamics: Weightage, Key Concepts and Study Plan
Chemical Thermodynamics in JEE Main: 126 questions across 2022–2026, rank #12 of 20 in Chemistry, stable momentum. Year-wise data, key concepts and a study plan.
Edurack
October 21, 2026
Chemical Thermodynamics is a dependable mid-weight chapter in JEE Main Chemistry, ranked #12 of 20 with 4.8% of recent questions. Here is what five years of JEE Main questions say about it, and how to prepare.
At a glance
- 126 questions across 2022–2026, all shifts
- 4.3% of Chemistry over five years and 4.8% in 2024–2026
- Rank #12 of 20 Chemistry chapters by recent weight
- Momentum: Stable
- Asked in 5 of 5 years; busiest year 2022 with 27 questions
- 24 questions in the 2026 papers
Year-wise questions
| Year | 2022 | 2023 | 2024 | 2025 | 2026 | Total |
|---|---|---|---|---|---|---|
| Questions | 27 | 27 | 26 | 22 | 24 | 126 |
How Chemical Thermodynamics compares inside Chemistry
| Rank | Chapter | Total Qs | 2024–26 share | Momentum |
|---|---|---|---|---|
| 10 | Some Basic Concepts in Chemistry | 128 | 5.1% | Stable |
| 11 | d- and f-Block Elements | 137 | 5.0% | Stable |
| 12 | Chemical Thermodynamics | 126 | 4.8% | Stable |
| 13 | Equilibrium | 126 | 4.8% | Stable |
| 14 | Chemical Kinetics | 112 | 4.3% | Stable |
Concepts that repeat
In our data no single concept dominates Chemical Thermodynamics. Its questions are spread across the syllabus, so work through every sub-topic rather than a short list.
What the syllabus covers
System and surroundings, state functions, first law, enthalpy, Hess's law, enthalpies of various processes, entropy, second law, spontaneity, Gibbs energy and the equilibrium constant.
A checklist to tick off:
- System and surroundings
- State functions
- First law
- Enthalpy
- Hess's law
- Enthalpies of various processes
- Entropy
- Second law
- Spontaneity
- Gibbs energy and the equilibrium constant
What to focus on
Hess's law, enthalpy changes, spontaneity through Gibbs energy, and the relation between ΔG and the equilibrium constant.
A study plan for this chapter
Treat it as a dependable source of marks and keep it in your regular revision cycle. If you divide your Chemistry time in proportion to recent weightage, this chapter earns about 5% of it.
- Days 1–4: theory and solved examples.
- Days 5–9: chapter-wise PYQs and error log.
- Ongoing: a short revision every ten days.
Keep reading
- The full ranking: JEE Main Chemistry chapter-wise weightage
- Next chapter by weight: Equilibrium
- A heavier neighbour: d- and f-Block Elements
See Chemical Thermodynamics on the weightage page →
Frequently Asked Questions
How many questions has Chemical Thermodynamics had in JEE Main?
126 questions across 2022–2026, counting every shift: 2022: 27, 2023: 27, 2024: 26, 2025: 22, 2026: 24.
Is Chemical Thermodynamics important for JEE Main Chemistry?
It ranks #12 of 20 Chemistry chapters by recent weight, which puts it in tier 2 of 3 for preparation. Its momentum is labelled Stable.
How should I start Chemical Thermodynamics?
Hess's law, enthalpy changes, spontaneity through Gibbs energy, and the relation between ΔG and the equilibrium constant. Then solve chapter-wise previous-year questions.