Questions
16
across 8 papers
Share of subject
4%
of 398 Chemistry Qs
Weightage rank
#11
of 31 chapters
Difficulty
3 easy · 7 medium · 6 hard
Thermodynamics contributed 16 of the 398 NEET Chemistry questions between 2020 and 2026 (Re-NEET 2026 included). That is 4% of the subject and makes it the #11 chapter out of 31 by weightage — roughly 2 questions per paper, peaking at 3 in NEET 2024.
Of the 16 questions tagged for difficulty, 19% were easy, 43% medium and 38% hard — a chapter that tends to bring the tougher questions.
Its weight has stayed fairly steady: 2 questions per paper across NEET 2025, NEET 2026 and Re-NEET 2026, against 1.7 in 2020–2022.
The single most-tested topic is Change in Thermodynamics Properties in Expansion or Contraction of Gas — 2 questions across 2 papers.
15 topics tagged under Thermodynamics. Numbers show how many questions each topic had in each paper; E / M / H are the easy, medium and hard counts.
| Topic | 2020 | 2021 | 2022 | 2023 | 2024 | 2025 | 2026 | Re | Total | E | M | H |
|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Change in Thermodynamics Properties in Expansion or Contraction of Gas | 1 | 1 | – | – | – | – | – | – | 2 | – | 2 | – |
| Enthalpy Change (Standard Enthalpy of Formation (ΔH°f)) | – | – | – | – | – | 1 | – | – | 1 | – | – | 1 |
| Enthalpy Change (Thermochemical Equations) | – | – | – | – | – | – | – | 1 | 1 | – | 1 | – |
| Gibbs Energy Change and Equilibrium | – | – | – | – | – | – | 1 | – | 1 | – | – | 1 |
| Gibbs Energy Change and Non-Mechanical Work | – | – | – | 1 | – | – | – | – | 1 | – | 1 | – |
| Internal Energy | – | – | – | – | – | – | 1 | – | 1 | 1 | – | – |
| Measurement of dU and dH: Bomb Calorimeter (dH Measurements) | – | – | – | 1 | – | – | – | – | 1 | 1 | – | – |
| Pressure-Volume Work | – | – | 1 | – | – | – | – | – | 1 | – | 1 | – |
| Relationship Between Cp and Cv (Relationship Between Heat of Reaction at Constant P…) | – | 1 | – | – | – | – | – | – | 1 | 1 | – | – |
| Spontaneity: Second Law of Thermodynamics (Entropy and Spontaneity) | 1 | – | – | – | – | – | – | – | 1 | – | – | 1 |
| Spontaneity: Second Law of Thermodynamics (Entropy for Different Processes) | – | – | – | – | 1 | – | – | – | 1 | – | – | 1 |
| Spontaneity: Second Law of Thermodynamics (Entropy) | – | – | – | – | – | – | – | 1 | 1 | – | – | 1 |
| Thermodynamic Processes (Adiabatic Process) | – | – | – | – | 1 | – | – | – | 1 | – | 1 | – |
| Thermodynamic Processes (Isothermal Process) | – | – | – | – | 1 | – | – | – | 1 | – | 1 | – |
| Work | – | – | – | – | – | – | – | 1 | 1 | – | – | 1 |
No topic has appeared in three or more different papers.
In the NEET papers from 2020 to 2026 (including Re-NEET 2026), 16 Chemistry questions came from Thermodynamics — 4% of the subject, or about 2 per paper.
By past weightage it ranks #11 of 31 Chemistry chapters, so it is an above-average-weightage Chemistry chapter, with 16 questions over 2020–2026.
The most-tested topics are Change in Thermodynamics Properties in Expansion or Contraction of Gas (2), Enthalpy Change (Standard Enthalpy of Formation (ΔH°f)) (1) and Enthalpy Change (Thermochemical Equations) (1). The topic table above lists every topic with its count in each paper.
Of the 16 difficulty-tagged questions, 19% were easy, 43% medium and 38% hard.
Enthalpy Change (Thermochemical Equations), Gibbs Energy Change and Equilibrium, Internal Energy and Spontaneity: Second Law of Thermodynamics (Entropy) and more were asked in the 2026 papers.
Edurack has chapter-wise NEET previous-year questions for Thermodynamics. Use the practice button on this page to open the set, attempt questions and check your answers.
Counts come from Edurack's tagged set of NEET papers 2020–2026 (including Re-NEET 2026), mapped to NCERT chapters and topics. Use them as a trend guide — past frequency doesn't guarantee what a future paper will ask.