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Chemical Thermodynamics Important Questions for NEET Chemistry - 2026

Q: 1. What are the most important questions from Chemical Thermodynamics for NEET practice?

Students should focus on concept-based numericals, assertion and reason questions, and fundamental MCQs from topics like the first and second law of thermodynamics, Gibbs free energy, enthalpy changes, and spontaneity. Regularly practicing these shapes your preparation for NEET’s exam-focused pattern.

Q: 2. Which Chemical Thermodynamics subtopics are frequently asked in NEET important questions?

Key NEET questions typically come from these subtopics:First law of thermodynamics and enthalpy changeTypes of thermodynamic processesHess’s law and enthalpy calculationsSpontaneity, entropy, and Gibbs free energyEquilibrium constant and Delta G relation

Q: 3. How should I approach numericals in Chemical Thermodynamics for NEET?

To solve NEET numericals, understand key thermodynamic equations and unit conversion rules. Practice by:Identifying what’s given and requiredApplying correct formulas (like for work, enthalpy, Gibbs energy)Carefully checking units and signsRegular practice helps you avoid common calculation errors.

Q: 4. What NEET type questions are commonly framed from the first law of thermodynamics?

Expect MCQs, assertion and reason types, and numericals based on internal energy, enthalpy changes, heat capacity, and definition-based questions on state functions. Be ready to solve problems involving work done by/on the system, especially for different thermodynamic processes.

Q: 5. Are assertion reason questions from thermodynamic spontaneity and Delta G important for NEET?

Yes, NEET often tests assertion reason questions on spontaneity, entropy change ($\Delta S$), and change in Gibbs free energy ($\Delta G$). Focus on understanding conditions for spontaneity and how $\Delta G$ links with equilibrium. Revise scenarios where $\Delta G

Q: 6. How can I quickly revise all exam-focused formulas from Chemical Thermodynamics?

Make a summary cheat-sheet of NEET-important formulas covering:First law: $\Delta U = q + w$Enthalpy: $H = U + PV$Gibbs free energy: $\Delta G = \Delta H - T \Delta S$Equilibrium relation: $\Delta G^0 = -RT \ln K$Quickly reviewing these helps in last-minute practice and revisions.

Q: 7. What mistakes to avoid while solving NEET important questions from Chemical Thermodynamics?

Common mistakes include:Missing negative/positive sign conventionsConfusing state functions with path functionsIncorrect formula applicationNeglecting unit consistency in calculationsCareful reading and practicing various NEET question types improve accuracy.

Practice Chemical Thermodynamics Important Questions - Free PDF Download

Get ready to learn Chemical Thermodynamics with Vedantu’s NEET Important Questions. This chapter in Chemistry is key for NEET preparation. Here you’ll find important practice questions with easy answers.

Chemical Thermodynamics covers basics like system, surroundings, state functions, and different types of processes. You will also learn about the first and second laws of thermodynamics including heat, work, enthalpy, and spontaneity. Topics such as Hess’s Law, enthalpies of formation, and Gibbs free energy are also included.

These questions will help you understand each concept for NEET Chemistry. You can use Vedantu’s free NEET Important Questions PDF to practice and check answers. Download the PDF now and get ready for your exams.

Practice Chemical Thermodynamics Important Questions - Free PDF Download

1. Multiple choice questions.

1. Which of the following is an extensive property?

(a) Temperature
(b) Pressure
(c) Volume
(d) Density

Answer: (c) Volume

2. The first law of thermodynamics states that:

(a) Energy can be created
(b) Energy can be destroyed
(c) Energy is conserved
(d) Volume is constant

Answer: (c) Energy is conserved

3. Which is true for a spontaneous process at constant temperature and pressure?

(a) $\Delta G > 0$
(b) $\Delta G = 0$
(c) $\Delta G < 0$
(d) $\Delta H$ = 0

Answer: (c) $\Delta G < 0$

4. For which process is enthalpy of sublimation defined?

(a) Liquid $\rightarrow$ Solid
(b) Gas $\rightarrow$ Liquid
(c) Solid $\rightarrow$ Gas
(d) Liquid $\rightarrow$ Gas

Answer: (c) Solid $\rightarrow$ Gas

5. Which law allows calculation of enthalpy change for a reaction using enthalpy changes for multiple steps?

(a) Boyle’s law
(b) Hess’s law
(c) Charles’s law
(d) Gay-Lussac’s law

Answer: (b) Hess’s law

2. Very Short Answer (VSA).

1. Define intensive property with an example.

Answer: An intensive property is independent of the amount of substance present, such as temperature or pressure.

2. What is the state function? Give one example.

Answer: A state function depends only on the initial and final states, not the path taken. Example: Enthalpy (H).

3. Write the mathematical expression of the first law of thermodynamics.

Answer: $\Delta U = q + w$ where $\Delta U$ is change in internal energy, $q$ is heat, and $w$ is work.

4. What does $\Delta G < 0$ imply about a chemical process?

Answer: If $\Delta G < 0$, the process is spontaneous under the given conditions.

5. State Hess’s law of constant heat summation.

Answer: The total enthalpy change of a reaction is the same, regardless of the path by which the reaction occurs.

3. Short Answer Questions.

1. Differentiate between extensive and intensive properties with two examples each.

Answer: Extensive properties depend on the quantity of matter, such as mass and volume. Intensive properties are independent of quantity, like temperature and density. For instance, doubling a sample doubles its mass (extensive), but temperature (intensive) remains unchanged.

2. A gas is compressed by a constant pressure of 1 atm from 10 L to 4 L. Calculate the work done on the gas.

Answer:

Work, $w = -P\Delta V$
$\Delta V = V_\text{final} - V_\text{initial} = 4-10 = -6$ L
$w = -(1\, \text{atm}) \times (-6\, \text{L}) = 6$ L·atm
1 L·atm = 101.3 J; $w = 6 \times 101.3 = 607.8$ J

3. Explain the significance of Gibbs free energy in predicting spontaneity of a process.

Answer: Gibbs free energy ($\Delta G$) helps predict whether a process will proceed without external assistance. If $\Delta G$ is negative, the process is spontaneous. If positive, the process is non-spontaneous. At equilibrium, $\Delta G$ is zero.

4. State and explain Hess’s law with a suitable example.

Answer: Hess’s law states that total enthalpy change is the same irrespective of the pathway. For example, carbon combusting directly to CO$_2$ or via CO as intermediate, the sum of enthalpy changes for steps equals direct enthalpy change.

5. Write the relation between standard Gibbs free energy change and equilibrium constant.

Answer: The relation is $\Delta G^\circ = -RT \ln K$ where $\Delta G^\circ$ is standard Gibbs free energy change, $R$ is gas constant, $T$ is temperature in Kelvin, and $K$ is equilibrium constant.

4. True or False Questions.

1. Enthalpy is a state function.

Answer: True

2. Spontaneous processes always occur rapidly.

Answer: False

3. Internal energy is an intensive property.

Answer: False

4. The entropy of the universe always increases for spontaneous processes.

Answer: True

3. Fill in the Blanks Questions.

1. The enthalpy change when one mole of a substance changes directly from solid to gas is called _______.

Answer: enthalpy of sublimation

2. The total energy change in a reaction is the same by any route. This principle is known as _______.

Answer: Hess’s law

3. The SI unit of heat capacity is _______.

Answer: joule per kelvin (J K$^{-1}$)

4. For a process to be spontaneous at constant temperature and pressure, $\Delta G$ should be _______.

Answer: negative

5. The mathematical expression for the first law of thermodynamics is _______.

Answer: $\Delta U = q + w$

How Understanding Chemical Thermodynamics Helps in NEET Chemistry

If you’re aiming for top NEET Chemistry scores, mastering chemical thermodynamics is essential. This chapter builds concepts about energy changes, spontaneity, and equilibrium, which are commonly tested in NEET and helpful for your future in medical science.

Thermodynamics teaches you about heat, work, and the laws of energy conversion. Understanding state functions and spontaneity criteria can help you solve everyday NEET questions with clarity and confidence. These basics are also crucial for further studies in Chemistry.

At Vedantu, we support your NEET journey with clear, student-friendly explanations and problem-solving tips. Practicing these important thermodynamics questions will prepare you for both fundamental concepts and their real-life applications in exams and beyond.

FAQs on Chemical Thermodynamics Important Questions for NEET Chemistry - 2026

1. What are the most important questions from Chemical Thermodynamics for NEET practice?

Students should focus on concept-based numericals, assertion and reason questions, and fundamental MCQs from topics like the first and second law of thermodynamics, Gibbs free energy, enthalpy changes, and spontaneity. Regularly practicing these shapes your preparation for NEET’s exam-focused pattern.

2. Which Chemical Thermodynamics subtopics are frequently asked in NEET important questions?

Key NEET questions typically come from these subtopics:

First law of thermodynamics and enthalpy change
Types of thermodynamic processes
Hess’s law and enthalpy calculations
Spontaneity, entropy, and Gibbs free energy
Equilibrium constant and Delta G relation

3. How should I approach numericals in Chemical Thermodynamics for NEET?

To solve NEET numericals, understand key thermodynamic equations and unit conversion rules. Practice by:

Identifying what’s given and required
Applying correct formulas (like for work, enthalpy, Gibbs energy)
Carefully checking units and signs

Regular practice helps you avoid common calculation errors.

4. What NEET type questions are commonly framed from the first law of thermodynamics?

Expect MCQs, assertion and reason types, and numericals based on internal energy, enthalpy changes, heat capacity, and definition-based questions on state functions. Be ready to solve problems involving work done by/on the system, especially for different thermodynamic processes.

5. Are assertion reason questions from thermodynamic spontaneity and Delta G important for NEET?

Yes, NEET often tests assertion reason questions on spontaneity, entropy change ($\Delta S$), and change in Gibbs free energy ($\Delta G$). Focus on understanding conditions for spontaneity and how $\Delta G$ links with equilibrium. Revise scenarios where $\Delta G<0$ or $\Delta G=0$.

6. How can I quickly revise all exam-focused formulas from Chemical Thermodynamics?

Make a summary cheat-sheet of NEET-important formulas covering:

First law: $\Delta U = q + w$
Enthalpy: $H = U + PV$
Gibbs free energy: $\Delta G = \Delta H - T \Delta S$
Equilibrium relation: $\Delta G^0 = -RT \ln K$

Quickly reviewing these helps in last-minute practice and revisions.

7. What mistakes to avoid while solving NEET important questions from Chemical Thermodynamics?

Common mistakes include:

Missing negative/positive sign conventions
Confusing state functions with path functions
Incorrect formula application
Neglecting unit consistency in calculations

Careful reading and practicing various NEET question types improve accuracy.