JEE Chemistry

Internal Energy & Enthalpy: JEE Questions & Solutions

31 previous-year JEE Chemistry questions on Internal Energy & Enthalpy, each with a worked step-by-step solution.

Intermediate

Previous-year questions

  1. 01Which of the following graphs between pressure p versus volume V represents the maximum work done?MCQEasyJEE 2026
  2. 02Match the LIST-I with LIST-II | LIST-I (Thermodynamic Process) | LIST-II (Magnitude in kJ) | |---|---| | (A) Work done in reversible,…MCQMediumJEE 2026
  3. 03A cup of water at 5^° C (system) is placed in a microwave oven and the oven is turned on for one minute during which the water begins to…MCQEasyJEE 2026
  4. 04Match the LIST-I with LIST-II for an isothermal process of an ideal gas system. List-I List-II Work done (V_f > Vᵢ) A. Reversible expansion…MCQEasyJEE 2026
  5. 0520.0 dm³ of an ideal gas X at 600 K and 0.5 MPa undergoes isothermal reversible expansion until the pressure of the gas becomes 0.2 MPa.…MCQMediumJEE 2026
  6. 06A liquid when kept inside a thermally insulated closed vessel at 25^°C was mechanically stirred from outside. What will be the correct…MCQEasyJEE 2025
  7. 07Match List - I with List - II | List - I (Partial Derivatives) | List - II (Thermodynamic Quantity) | |---|---| | (A) ((∂ G)/(∂ T))_P | (I)…MCQMediumJEE 2025
  8. 08The bond dissociation enthalpy of X₂ calculated from the given data is kJ mol⁻¹ (nearest integer). Given: M⁺X⁻(s) → M⁺(g) + X⁻(g), Δ…NVAEasyJEE 2025
  9. 09Which of the following mixing of 1 M base and 1 M acid leads to the largest increase in temperature?MCQEasyJEE 2025
  10. 10An ideal gas undergoes a cyclic transformation starting from point A and coming back to the same point by tracing the path A→B→C→D→A as…MCQEasyJEE 2025
  11. 11500 J of energy is transferred as heat to 0.5 mol of Argon gas at 298 K and 1.00 atm. The final temperature and the change in internal…MCQMediumJEE 2025
  12. 12Two vessels A and B are connected via stopcock. Vessel A is filled with a gas at a certain pressure. The entire assembly is immersed in…MCQMediumJEE 2025
  13. 13Which of the following properties will change when system containing solution 1 will become solution 2 ? Solution 1: 10 mol of solute x +…MCQEasyJEE 2025
  14. 14Given below are two statements: Statement I: When a system containing ice in equilibrium with water (liquid) is heated, heat is absorbed by…MCQEasyJEE 2025
  15. 15A perfect gas (0.1 mol) having C_V = 1.50 R (independent of temperature) undergoes the above transformation from point 1 to point 4. If…NVAEasyJEE 2025
  16. 16A sample of n-octane (1.14 g) was completely burnt in excess of oxygen in a bomb calorimeter, whose heat capacity is 5 kJ K⁻¹. As a result…NVAEasyJEE 2025
  17. 17One mole of an ideal gas expands isothermally and reversibly from 10 dm³ to 20 dm³ at 300 K. Δ U, q and work done in the process…MCQEasyJEE 2025
  18. 18Consider the given data: (a) HCl(g) + 10H₂O(l) → HCl.10 H₂O Δ H = -69.01 kJ/mol⁻¹ (b) HCl(g) + 40H₂O(l) → HCl.40 H₂O Δ H = -72.79 kJ/mol⁻¹…MCQEasyJEE 2025
  19. 19Total enthalpy change for freezing of 1 mol water at 10^° C to ice at -10^° C is (Given: Δ_fusH = x kJ/mol, C_p[H₂O(l)] = y J mol⁻¹ K⁻¹,…MCQEasyJEE 2025
  20. 20The hydration energies of K⁺ and Cl⁻ are -x and -y kJ/mol respectively. If lattice energy of KCl is -z kJ/mol, then the heat of solution of…MCQEasyJEE 2025
  21. 21The correct statement amongst the following is:MCQEasyJEE 2025
  22. 22If three moles of an ideal gas at 300 K expand isothermally from 30 dm³ to 45 dm³ against a constant opposing pressure of 80 kPa, then the…NVAEasyJEE 2024
  23. 23Standard enthalpy of vaporization for CCl₄ is 30.5 kJ/mol. Heat required for vaporization of 284 g of CCl₄ at constant temperature is:MCQEasyJEE 2024
  24. 24An ideal gas undergoes a cyclic transformation starting from the point A and coming back to the same point by tracing the path A → B → C →…NVAMediumJEE 2024
  25. 25One mole of an ideal monatomic gas is subjected to the changes 1 → 2 → 3 → 1 plotted on a pressure (in bar) versus volume (in L) diagram,…NVAMediumJEE 2023
  26. 26An athlete is given 100 g of glucose (C₆H₁₂O₆) for energy, which is equivalent to 1800 kJ of energy. If 50% of this energy is utilized for…NVAEasyJEE 2023
  27. 27When 2 liters of ideal gas expands isothermally into a vacuum to a total volume of 6 liters, the change in internal energy is J. (Nearest…NVAEasyJEE 2023
  28. 281 mole of ideal gas is allowed to expand reversibly and adiabatically from a temperature of 27^° C. The work done is 3 kJ mol⁻¹. The final…NVAEasyJEE 2023
  29. 29Enthalpies of formation of CCl₄(g), H₂O(g), CO₂(g) and HCl(g) are -105, -242, -394, and -92 kJ/mol respectively. The magnitude of enthalpy…NVAEasyJEE 2023
  30. 300.3 g of ethane undergoes combustion at 27^° C in a bomb calorimeter. The temperature of calorimeter system (including the water) is found…NVAMediumJEE 2023
  31. 31When a 60 W electric heater is immersed in a gas for 100 s in a constant volume container with adiabatic walls, the temperature of the gas…NVAEasyJEE 2023

Frequently asked questions

Our bank has 31 previous-year JEE Chemistry questions tagged to Internal Energy & Enthalpy, drawn from JEE papers between 2023 and 2026, including 5 from 2026 alone. Each comes with a full step-by-step solution.

Internal Energy & Enthalpy is rated Intermediate overall for JEE Chemistry. The PYQs on this page break down as 23 easy, 8 medium.

Of the 31 previous-year questions on Internal Energy & Enthalpy, 19 are multiple-choice (MCQ) and 12 are numerical-value (NVA) questions.

Based on recent paper analysis, Internal Energy & Enthalpy is worth about 2 marks in JEE Main. It sits in Chemical Thermodynamics, a Class 11 Chemistry chapter.

More Chemical Thermodynamics topics

Gibbs Free Energy & Equilibrium Constant12Enthalpies (Bond, Combustion, Formation…)10Hess's Law9Entropy & Spontaneity6System & Surroundings2

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