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Chemistry - Thermodynamics (C)

Practise 46 JEE Advanced previous year questions on Thermodynamics (C), compiled from papers spanning 2006 to 2026. Each question is pulled directly from the actual exam paper it appeared in, so you're practising in the exact style and difficulty JEE Advanced tests.

Thermodynamics (C) has been asked in 21 of the 27 years of JEE Advanced papers analysed (2000–2026), with 46 questions in all. 15% of them were easy, 46% moderate and 39% tough. Most of its questions came from 2023, with 4 questions that year. In the last three years (2024–2026) it had 4 questions across 6 papers, about 0.7 per paper.

The chapter's 6 topics are not weighted equally: First Law and Basic Fundamentals of Thermodynamics (15 questions, 33%), Laws of Thermochemistry and Enthalpy Change (10 questions, 22%), and Third law of thermodynamics (9 questions, 20%) have been asked the most. Over the last five years the most frequent topics have been Laws of Thermochemistry and Enthalpy Change (4), First Law and Basic Fundamentals of Thermodynamics (3), and Entropy and Second law of thermodynamics (2). First Law and Basic Fundamentals of Thermodynamics has produced the most tough questions (5).

  1. 1An ideal gas ( mol), initially at bar pressure, is compressed at a constant temperature of K in two steps: first, against a constant externa2026 (Paper 1)First Law and Basic Fundamentals of Thermodynamics
  2. 2List-I contains various physical/chemical processes, and List-II contains combinations of changes in enthalpy ( ) and entropy ( ). Match eac2026 (Paper 1)Laws of Thermochemistry and Enthalpy Change
  3. 3Considering ideal gas behavior, the expansion work done (in kJ) when 144 g of water is electrolyzed completely under constant pressure at 302025 (Paper 1)First Law and Basic Fundamentals of Thermodynamics
  4. 4Consider the following volume-temperature diagram for the expansion of 5 moles of an ideal monoatomic gas. Considering only P-V work is invo2024 (Paper 1)Laws of Thermochemistry and Enthalpy Change
  5. 5One mole of an ideal monoatomic gas undergoes two reversible processes ( A B and B C ) as shown in the given figure: A B is an adiabatic pro2023 (Paper 1)First Law and Basic Fundamentals of Thermodynamics
  6. 6In a one-litre flask, 6 moles of A undergoes the reaction A ( g ) P ( g ) . The progress of product formation at two temperatures (in Kelvin2023 (Paper 1)Third law of thermodynamics
  7. 7The entropy versus temperature plot for phases and at 1 bar pressure is given. S T and S 0 are entropies of the phases at temperatures T and2023 (Paper 2)Entropy and Second law of thermodynamics
  8. 8The entropy versus temperature plot for phases and at 1 bar pressure is given. S T and S 0 are entropies of the phases at temperatures T and2023 (Paper 2)Laws of Thermochemistry and Enthalpy Change
  9. 92 mol of Hg g is combusted in a fixed volume bomb calorimeter with excess of O 2 at 298 K and 1 atm into HgO s . During the reaction, temper2022 (Paper 1)Laws of Thermochemistry and Enthalpy Change
  10. 10The correct option(s) about entropy (S) is(are) [ R = gas constant, F = Faraday constant, T = Temperature]2022 (Paper 2)Entropy and Second law of thermodynamics
  11. 11For the reaction, , the plot of versus is given below (in solid line), where is the pressure (in bar) of the gas at temperature and bar. (Gi2021 (Paper 1)Third law of thermodynamics
  12. 12For the reaction, , the plot of versus is given below (in solid line), where is the pressure (in bar) of the gas at temperature and bar. (Gi2021 (Paper 1)Third law of thermodynamics
  13. 13An ideal gas undergoes a reversible isothermal expansion from state I to state II followed by a reversible adiabatic expansion from state II2021 (Paper 1)First Law and Basic Fundamentals of Thermodynamics
  14. 14One mole of an ideal gas at 900 K , undergoes two reversible processes, I followed by II , as shown below. If the work done by the gas in th2021 (Paper 2)First Law and Basic Fundamentals of Thermodynamics
  15. 15In thermodynamics, the P - V work done is given by w = - dVP ext . For a system undergoing a particular process, the work done is, w = - dV 2020 (Paper 1)First Law and Basic Fundamentals of Thermodynamics
  16. 16Tin is obtained from cassiterite by reduction with coke. Use the data given below to determine the minimum temperature (in K ) at which the 2020 (Paper 2)Laws of Thermochemistry and Enthalpy Change
  17. 17Choose the reaction(s) from the following options, for which the standard enthalpy of reaction is equal to the standard enthalpy of formatio2019 (Paper 1)Laws of Thermochemistry and Enthalpy Change
  18. 18A reversible cyclic process for an ideal gas is shown below. Here, P , V , a n d T are pressure, volume and temperature, respectively. The t2018 (Paper 1)First Law and Basic Fundamentals of Thermodynamics
  19. 19For a reaction, A ⇌ P , the plots of A a n d P with time at temperatures T 1 a n d T 2 are given below. If T 2 > T 1 , the correct statement2018 (Paper 2)Entropy and Second law of thermodynamics
  20. 20The surface of copper gets tarnished by the formation of copper oxide. N 2 gas was passed to prevent the oxide formation during heating of c2018 (Paper 2)Third law of thermodynamics
  21. 21The standard state Gibb s free energies of formation of C (graphite) and C (diamond) at T = 298 K are f G o C ( graphite = 0 kJ mol - 1 f G 2017 (Paper 2)Third law of thermodynamics
  22. 22For a reaction taking place in a container in equilibrium with its surroundings, the effect of temperature on its equilibrium constant K in 2017 (Paper 2)Entropy and Second law of thermodynamics
  23. 23One mole of an ideal gas at 300 K in thermal contact with its surroundings expands isothermally from 1 . 0 L to 2 . 0 L against a constant p2016 (Paper 1)First Law and Basic Fundamentals of Thermodynamics
  24. 24Match the thermodynamic processes given under Column I with the expressions given under Column II. Column I Column II A. Freezing of water a2015 (Paper 1)Entropy and Second law of thermodynamics
  25. 25An ideal gas in a thermally insulated vessel at internal pressure = P 1 , volume = V 1 and absolute temperature = T 1 expands irreversibly a2014 (Paper 1)First Law and Basic Fundamentals of Thermodynamics
  26. 26For the process H 2 O l H 2 O g at T = 100 o C and 1 atmosphere pressure, the correct choice is2014 (Paper 2)Entropy and Second law of thermodynamics
  27. 27The standard enthalpies of formation of C O 2 ( g ) , H 2 O l and glucose (s) at 2 5 o C are - 400 kJ / mol , - 300 kJ / mol and - 1300 kJ /2013 (Paper 1)Laws of Thermochemistry and Enthalpy Change
  28. 28Paragraph: A fixed mass m of a gas is subjected to transformation of states from K to L to M to N and back to K as shown in the figure Quest2013 (Paper 2)First Law and Basic Fundamentals of Thermodynamics
  29. 29Paragraph: A fixed mass m of a gas is subjected to transformation of states from K to L to M to N and back to K as shown in the figure Quest2013 (Paper 2)First Law and Basic Fundamentals of Thermodynamics
  30. 30For an ideal gas, consider only P-V work in going from an initial state to the final state . The final state can be reached by either of the2012 (Paper 1)First Law and Basic Fundamentals of Thermodynamics
  31. 31Using the data provided, calculate the multiple bond energy of a bond in . That energy is (take the bond energy of a bond as )2012 (Paper 2)Laws of Thermochemistry and Enthalpy Change
  32. 32The reversible expansion of an ideal gas under adiabatic and isothermal conditions is shown in the figure. Which of the following statement(2012 (Paper 2)First Law and Basic Fundamentals of Thermodynamics
  33. 33Match the transformation in Column I with appropriate options in Column II.2011 (Paper 2)Entropy and Second law of thermodynamics
  34. 34The species which by definition has zero standard molar enthalpy of formation at is2010 (Paper 1)Laws of Thermochemistry and Enthalpy Change
  35. 35Among the following, intensive property is (properties are)2010 (Paper 1)System and surrounding
  36. 36One mole of an ideal gas is taken from to along two paths denoted by the solid and the dashed lines as shown in the graph below. If the work2010 (Paper 2)First Law and Basic Fundamentals of Thermodynamics
  37. 37Among the following, the state function(s) is (are)2009 (Paper 2)System and surrounding
  38. 38In a constant volume calorimeter, of a gas with molecular weight was burnt in excess oxygen at . The temperature of the calorimeter was foun2009 (Paper 2)Carnot engine
  39. 39Statement 1 For every chemical reaction at equilibrium, standard Gibbs energy of reaction is zero. Statement 2 At constant temperature and p2008 (Paper 1)Third law of thermodynamics
  40. 40Statement 1 There is a natural asymmetry between converting work to heat and converting heat to work. Statement 2 No process is possible in 2008 (Paper 2)Carnot engine
  41. 41The value of for a reaction is (Given: and )2007 (Paper 1)Third law of thermodynamics
  42. 42For the process (1 bar, (1 bar, , the correct set of thermodynamic parameters is2007 (Paper 2)Third law of thermodynamics
  43. 43A monoatomic ideal gas undergoes a process in which the ratio of to at any instant is constant and equals to 1 . What is the molar heat capa2006First Law and Basic Fundamentals of Thermodynamics
  44. 44The direct conversion of to is difficult, hence it is carried out by the following shown path. Given where eu is entropy unit, then is2006Entropy and Second law of thermodynamics
  45. 45Which is correct statement if is added at equilibrium condition?2006Third law of thermodynamics
  46. 46For the reaction, . Two moles of and one mole of are taken in a container of volume . They completely form two moles of , the gases deviate 2006Laws of Thermochemistry and Enthalpy Change

Frequently Asked Questions

1.How many questions are available for Thermodynamics (C)?

This chapter includes 46 questions compiled from JEE Advanced papers spanning 2006 to 2026.

2.Are these questions only from JEE Advanced, or from other exams too?

These are JEE Advanced questions specifically for the Thermodynamics (C) chapter. Questions from other exams like JEE Main or NTA Abhyas (JEE Main) are organised separately under their respective exam sections.

3.Is Thermodynamics (C) an important chapter for JEE Advanced Chemistry?

Thermodynamics (C) has appeared in 21 of the 21 years of JEE Advanced papers covered here, with 46 questions across 32 papers - about one per paper it appears in.

4.What is the difficulty level of Thermodynamics (C) questions in JEE Advanced?

Of the 46 questions analysed for this chapter, 15% are easy, 46% moderate and 39% tough. 2023 had the most, with 4 questions.

5.Which topics in Thermodynamics (C) should I focus on?

These topics have carried the most weightage in Thermodynamics (C):

  • First Law and Basic Fundamentals of Thermodynamics - 15 questions (33%)
  • Laws of Thermochemistry and Enthalpy Change - 10 questions (22%)
  • Third law of thermodynamics - 9 questions (20%)
  • First Law and Basic Fundamentals of Thermodynamics has produced the most tough questions (5).
6.Is Thermodynamics (C)'s weightage in JEE Advanced going up or down?

Across all 32 papers analysed, Thermodynamics (C) has averaged about 1.4 questions per paper. In the last three years (2024–2026), that average has fallen, at about 0.7 questions per paper. Use the year-wise numbers on this page for the exact trend before you decide how much time to give it.