NeetVictoryQuestion 1: Enthalpy and Spontaneity
For the melting of ice at 273 K, ΔH_fus = 6010 J/mol. The entropy of fusion is about:
- A 22 J/mol K
- B 2.2 J/mol K
- C 1.6 × 10⁶ J/mol K
- D 6010 J/mol K
Answer: A. 22 J/mol K
Why: ΔS = ΔH/T = 6010/273.
NEET Chemistry: Thermodynamics. Chapter-wise Practice Questions and Test
Thermodynamics is a Class 11 Chemistry chapter that carries about 3.2% of the Chemistry questions in NEET. Practise it with 44 questions covering 2 topics, each with an explanation.
Practise Thermodynamics
Open in the appSets of 15 questions that adapt to your level, with an explanation for every answer.
Topics covered in Thermodynamics
- Enthalpy and Spontaneity (27 questions)
- First Law of Thermodynamics (17 questions)
How often Thermodynamics has come up in NEET
Across the 13 previous year papers, Thermodynamics had 24 questions, about 1.8 a year. The most in one paper was 3, in NEET 2020.
| Paper | Questions from this chapter |
|---|---|
| NEET 2026 | 2 |
| NEET 2025 | 2 |
| NEET 2024 | 3 |
| NEET 2023 | 2 |
| NEET 2022 | 1 |
| NEET 2021 | 2 |
| NEET 2020 | 3 |
| NEET 2019 | 2 |
| NEET 2018 | 1 |
| NEET 2017 | 2 |
| NEET 2016 | 1 |
| Re-AIPMT 2015 | 1 |
| AIPMT 2014 | 2 |
Sample questions on Thermodynamics with answers
8 questions from the practice bank, spread across the chapter's topics. The full set is in the app.
Question 2: First Law of Thermodynamics
At constant pressure, the enthalpy change is related to the internal energy change by:
- A ΔH = ΔU + PΔV
- B ΔH = ΔU − PΔV²
- C ΔH = ΔU only
- D ΔH = ΔU/PΔV
Answer: A. ΔH = ΔU + PΔV
Why: H = U + PV.
Question 3: Enthalpy and Spontaneity
For an exothermic reaction, the enthalpy change ΔH is:
- A positive
- B negative
- C zero
- D undefined
Answer: B. negative
Why: Exothermic reactions release heat to the surroundings, so the enthalpy of the products is lower than that of the reactants, giving a negative ΔH.
Question 4: First Law of Thermodynamics
Which of the following is an intensive property?
- A mass
- B density
- C internal energy
- D volume
Answer: B. density
Why: Intensive properties do not depend on the quantity of matter.
Question 5: Enthalpy and Spontaneity
The enthalpy of formation of CO₂ is equal to the enthalpy of combustion of:
- A oxygen
- B diamond only
- C graphite
- D CO
Answer: C. graphite
Why: C(graphite) + O₂ → CO₂ is both the formation and the combustion reaction.
Question 6: First Law of Thermodynamics
The work done by a gas expanding into a vacuum (free expansion) is:
- A positive and large
- B zero
- C equal to PV
- D negative
Answer: B. zero
Why: The external pressure is zero, so w = −P_ext ΔV = 0.
Question 7: Enthalpy and Spontaneity
The entropy of a system is a measure of its:
- A pressure
- B enthalpy
- C disorder (randomness)
- D total energy
Answer: C. disorder (randomness)
Why: S = k ln W, where W is the number of microstates.
Question 8: First Law of Thermodynamics
The heat absorbed by a system at constant volume equals:
- A zero
- B the change in its enthalpy
- C the change in its internal energy
- D the work done by it
Answer: C. the change in its internal energy
Why: With ΔV = 0 there is no pressure–volume work, so q_v = ΔU.
Practise all of Thermodynamics
Open in the appFrequently asked questions
How many questions come from Thermodynamics in NEET?
Thermodynamics carries about 3.2% of the Chemistry questions in NEET. Across the 13 previous year papers on NeetVictory it appeared 24 times, about 1.8 questions a year.
Which class is Thermodynamics from?
Thermodynamics is a Class 11 Chemistry chapter in the NCERT syllabus.
Where can I practise Thermodynamics questions for NEET?
NeetVictory has 44 practice questions on Thermodynamics, each with an explanation, in sets of 15 that adapt to your level. This page shows a free sample.