Top Strategies to Score High in JEE Main Chemical Thermodynamics Mock Tests
Chemical Thermodynamics is a fundamental chapter in JEE Chemistry that explains how energy changes govern chemical reactions and equilibria. Mastering concepts like enthalpy, entropy, Gibbs free energy, and the laws of thermodynamics is key to solving high-scoring problems. Take this targeted mock test to reinforce your understanding and build confidence before the JEE Main exam!
Mock Test Instructions for the Chemical Thermodynamics Mock Test-3:
- 20 questions from Chemical Thermodynamics Mock Test-3
- Time limit: 20 minutes
- Single correct answer per question
- Correct answers appear in bold green after submission
How Can JEE Mock Tests Help You Master Chemical Thermodynamics?
- Identify and correct misunderstandings in enthalpy, entropy, and free energy concepts using focused mock test practice.
- Build speed and accuracy for solving thermodynamics numericals under real exam constraints.
- Assess your readiness by simulating JEE-level questions on state functions and spontaneity.
- Review analytical feedback to address weaknesses in the First and Second Laws of Thermodynamics.
- Boost retention of important formulas and problem-solving strategies for Chemical Thermodynamics.
Sharpen Your JEE Skills: Expert-Designed Mock Tests on Chemical Thermodynamics
- Practice structured chapter-wise MCQs to master internal energy, Gibbs free energy, and entropy changes.
- Experience authentic JEE Main exam patterns and negative marking for true performance insight.
- Tackle previous-year-inspired questions to deepen your understanding of thermodynamic processes.
- Monitor progress and focus revision on high-weightage chemical thermodynamics subtopics.
- Gain the confidence to solve tricky conceptual and calculation-based questions in Chemical Thermodynamics.
Subject-Wise Excellence: JEE Main Mock Test Links
| S.No. | Subject-Specific JEE Main Online Mock Tests |
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| 1 | Online FREE Mock Test for JEE Main Chemistry |
| 2 | Online FREE Mock Test for JEE Main Maths |
| 3 | Online FREE Mock Test for JEE Main Physics |
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FAQs on JEE Main 2025-26 Chemical Thermodynamics Mock Test: Your Ultimate Practice Guide
1. What is chemical thermodynamics?
Chemical thermodynamics is the branch of chemistry that deals with the study of the energy changes, mainly heat and work, associated with chemical reactions and physical transformations. It helps predict the direction, spontaneity, and extent of reactions using laws of thermodynamics.
2. State the first law of thermodynamics in chemistry.
The first law of thermodynamics (also called the law of conservation of energy) states that energy cannot be created or destroyed in any process; it can only be transformed from one form to another. Mathematically, it is expressed as ΔU = q + w, where ΔU is the change in internal energy, q is the heat added to the system, and w is work done on the system.
3. What is enthalpy change (ΔH) and how is it measured?
Enthalpy change (ΔH) represents the heat absorbed or released by a system at constant pressure. It is measured in joules (J) or kilojoules (kJ). A positive ΔH means the reaction is endothermic (absorbs heat), and a negative ΔH means it is exothermic (releases heat).
4. Explain the concept of entropy in thermodynamics.
Entropy (S) is a measure of the disorder or randomness in a system. In thermodynamics, a higher entropy implies greater molecular motion and randomness. For any spontaneous process, the total entropy of the universe (system plus surroundings) always increases.
5. What is Gibbs free energy and its significance?
Gibbs free energy (G) is a thermodynamic function defined as G = H - TS (where H is enthalpy, T is temperature in Kelvin, and S is entropy). The change in Gibbs free energy (ΔG) predicts whether a chemical reaction will be spontaneous at constant temperature and pressure. If ΔG < 0, the process is spontaneous.
6. Describe two real-life examples of chemical thermodynamics in daily life.
Chemical thermodynamics is evident in many daily activities such as:
• Photosynthesis in plants: Sunlight energy is converted to chemical energy.
• Combustion of fuels: Fuels like LPG or petrol burn, releasing heat that powers vehicles and stoves.
7. What is a spontaneous process in thermodynamics?
A spontaneous process is a reaction or change that occurs naturally under given conditions, without external help. In thermodynamics, spontaneity depends on the sign of ΔG (Gibbs free energy change); if ΔG is negative, the process is spontaneous.
8. Define standard enthalpy of formation.
Standard enthalpy of formation (ΔHf°) is the enthalpy change when one mole of a compound is formed from its elements in their standard states under standard conditions (298 K, 1 atm).
9. Why is the concept of chemical equilibrium important in chemical thermodynamics?
The concept of chemical equilibrium helps determine the final composition of a reaction mixture. Chemical thermodynamics quantifies equilibrium using Gibbs free energy and equilibrium constant, showing at what point the rates of forward and reverse reactions are equal.
10. What is the relation between enthalpy (ΔH), entropy (ΔS), and Gibbs free energy (ΔG)?
The relation is given by the equation ΔG = ΔH - TΔS, where T is the temperature in Kelvin. This allows prediction of reaction spontaneity by considering both enthalpy change and entropy change.
11. How is work done in a chemical system calculated?
In a chemical system, work (w) done, especially during expansion or compression of gases, is calculated as w = -PΔV, where P is external pressure and ΔV is the change in volume.
12. What is the significance of the second law of thermodynamics in chemical reactions?
The second law of thermodynamics states that the entropy of an isolated system always increases during a spontaneous process. This law explains why some reactions are irreversible and predicts directionality and feasibility of chemical changes.
