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Chemistry - Thermodynamics (C)

Practise 155 AP EAMCET previous year questions on Thermodynamics (C), compiled from papers spanning 2001 to 2025. Each question is pulled directly from the actual exam paper it appeared in, so you're practising in the exact style and difficulty AP EAMCET tests.

Thermodynamics (C) has been asked in 24 of the 24 years of AP EAMCET papers analysed (2001–2024), with 155 questions in all. 48% of them were easy, 50% moderate and 3% tough. Most of its questions came from 2022, with 22 questions that year. In the last three years (2022–2024) it had 61 questions across 28 papers, about 2.2 per paper.

The chapter's 5 topics are not weighted equally: Laws of Thermochemistry and Enthalpy Change (56 questions, 36%), First Law and Basic Fundamentals of Thermodynamics (43 questions, 28%), and Third law of thermodynamics (24 questions, 15%) have been asked the most. Laws of Thermochemistry and Enthalpy Change has also led over the last five years, with 31 questions. Laws of Thermochemistry and Enthalpy Change has produced the most tough questions (2).

  1. 15 moles of a gas is allowed to pass through a series of changes as shown in the graph, in a cyclic process. The processes and respectively a27 May, 2025 (M)First Law and Basic Fundamentals of Thermodynamics
  2. 21 mole of an ideal gas is allowed to expand isothermally and reversibly from 1 L to 5 L at 300 K. The change in enthalpy (in kJ ) is27 May, 2025 (M)First Law and Basic Fundamentals of Thermodynamics
  3. 3Consider the following. Statement-I : Both internal energy (U) and work (w) are state functions. Statement-II : During the free expansion of26 May, 2025 (M)First Law and Basic Fundamentals of Thermodynamics
  4. 4The signs of and for a reaction to be spontaneous at all temperatures respectively are26 May, 2025 (M)Third law of thermodynamics
  5. 5The number of extensive and intensive properties in the list given below is respectively density, enthalpy, mass, temperature, volume, press26 May, 2025 (E)System and surrounding
  6. 6One mole of ethanol (l) was completely burnt in oxygen to form and . What is the (in ) for this reaction? (The standard enthalpy of formatio26 May, 2025 (E)Laws of Thermochemistry and Enthalpy Change
  7. 7If and are standard enthalpy change and standard entropy change respectively for a reaction, the incorrect option is24 May, 2025 (M)Third law of thermodynamics
  8. 8The of is . What is the energy (in J ) required to raise 180 g of liquid water from to ?24 May, 2025 (M)First Law and Basic Fundamentals of Thermodynamics
  9. 9For which reaction ?23 May, 2025 (M)First Law and Basic Fundamentals of Thermodynamics
  10. 10At and for the following reaction are -10.5 kJ and What is (in kJ ) for this reaction ?23 May, 2025 (M)Third law of thermodynamics
  11. 11Identify the incorrect statements from the following. I. For adiabatic process, II) Enthalpy is an intensive property III) For the process, 23 May, 2025 (E)First Law and Basic Fundamentals of Thermodynamics
  12. 12Enthalpy of formation of and are and respectively. The quantity of heat liberated when 18 g of is burnt completely in oxygen is23 May, 2025 (E)Laws of Thermochemistry and Enthalpy Change
  13. 13Identify the correct statements from the following I) Work is a path function. II) Enthalpy is an extensive property III) Lattice enthalpy o22 May, 2025 (M)System and surrounding
  14. 14For which of the following processes entropy change is negative ? I) Sublimation of dry ice II) Freezing of water III) Crystallisation of th22 May, 2025 (M)Entropy and Second law of thermodynamics
  15. 15Consider the following reaction At if of the reaction is -9 kJ, the standard entropy change (in ) of the same reaction at same temperature i22 May, 2025 (E)Entropy and Second law of thermodynamics
  16. 16One mole of was completely burnt in oxygen to form and . The standard enthalpy of formation of and is respectively. What is (in ) for this r22 May, 2025 (E)Laws of Thermochemistry and Enthalpy Change
  17. 17At 273 K the maximum work done when pressure on 10 g of hydrogen is reduced from 10 atm to 1 atm under isothermal, reversible conditions is 21 May, 2025 (M)First Law and Basic Fundamentals of Thermodynamics
  18. 18At for the following reaction is . What is the equilibrium constant for this reaction?21 May, 2025 (M)Third law of thermodynamics
  19. 19Consider the following Statement-I : During isothermal expansion of an ideal gas its enthalpy decreases. Statement-II : When 2.0 L of an ide21 May, 2025 (E)First Law and Basic Fundamentals of Thermodynamics
  20. 20The energy required to increase the temperature of 180 g of liquid water from to is 3765 J. What is of water in ?21 May, 2025 (E)First Law and Basic Fundamentals of Thermodynamics
  21. 21A 10 L vessel contains 1 mole of an ideal gas with pressure of and temperature of . The vessel is divided into two equal parts. The pressure23 May, 2024 (M)System and surrounding
  22. 22Observe the following reactions I. II. III. Identify the reactions in which entropy increases23 May, 2024 (M)Entropy and Second law of thermodynamics
  23. 23What is the enthalpy change (in J) for converting 9 g of (l) at to (l) at ? (1)) density of22 May, 2024 (M)Laws of Thermochemistry and Enthalpy Change
  24. 24A, B, C and D are some compounds. The enthalpy of formation of and is and respectively. What is in for the given reaction?22 May, 2024 (M)Laws of Thermochemistry and Enthalpy Change
  25. 25Observe the following reaction for this reaction is . What is its (in ) at the same temperature?22 May, 2024 (E)Laws of Thermochemistry and Enthalpy Change
  26. 26A vessel of volume V L contains an ideal gas at . The vessel is partitioned into two equal parts. The volume (in L ) and temperature (in K )22 May, 2024 (E)System and surrounding
  27. 27At for the reaction is -11.5 kJ . The equilibrium constant at 300 K is approximately22 May, 2024 (E)Third law of thermodynamics
  28. 28Two statements are given below. Statement I: The reaction is thermodynamically feasible Statement II: The above reaction occurs at room temp22 May, 2024 (E)Third law of thermodynamics
  29. 29Identify the correct statements from the following I. is zero for reaction II. The entropy of pure crystalline solids approaches zero as the21 May, 2024 (M)Third law of thermodynamics
  30. 30Observe the following reactions The enthalpy of dilution in is21 May, 2024 (M)Laws of Thermochemistry and Enthalpy Change
  31. 31Identify the correct equation relating and for 1 mole of an ideal gas from the following ( gas constant)21 May, 2024 (E)First Law and Basic Fundamentals of Thermodynamics
  32. 32The number of extensive properties in the following list is enthalpy, density, volume, internal energy, temperature.21 May, 2024 (E)System and surrounding
  33. 33Observe the following reaction The standard enthalpy of formation of is20 May, 2024 (M)Laws of Thermochemistry and Enthalpy Change
  34. 34Identify the molecule for which the enthalpy of atomization and bond dissociation enthalpy are not equal)20 May, 2024 (M)Laws of Thermochemistry and Enthalpy Change
  35. 35The volume of an ideal gas contracts from 10.0 L to 2.0 L under an applied pressure of 2.0 atm . During contraction the system also evolved 20 May, 2024 (E)First Law and Basic Fundamentals of Thermodynamics
  36. 36The molar heats of fusion and vapourisation of benzene are 10.9 and respectively. The changes in entropy for the solid liquid and liquid vap20 May, 2024 (E)Entropy and Second law of thermodynamics
  37. 37Given below are two statements: Statement-I: For isothermal irreversible change of an ideal gas, Statement - II: For adiabatic change, The c19 May, 2024 (E)First Law and Basic Fundamentals of Thermodynamics
  38. 38A thermodynamic process ( ) was completed as shown below. The work done is equal to area under the limits19 May, 2024 (E)First Law and Basic Fundamentals of Thermodynamics
  39. 39At 300 K , for the reaction . the is . What is the heat absorbed (in ) by the system?18 May, 2024 (M)Third law of thermodynamics
  40. 40Identify the incorrect statements from the following I. II. : for this process entropy change decreases III. Entropy units are18 May, 2024 (M)Entropy and Second law of thermodynamics
  41. 41The isotherms of an ideal gas at along with their slopes (m) (in the brackets) are shown here. If , then the correct order of slopes of thes19 May, 2023 (M)First Law and Basic Fundamentals of Thermodynamics
  42. 42The standard enthalpy of atomization of ethane according to the equation is . If standard mean bond dissociation enthalpy is , the standard 19 May, 2023 (M)Laws of Thermochemistry and Enthalpy Change
  43. 43If standard molar enthalpy change and standard molar internal energy change measured in bomb calorimeter are equal, which one of the followi19 May, 2023 (M)Laws of Thermochemistry and Enthalpy Change
  44. 44Identify the pair in which both are not extensive properties18 May, 2023 (M)System and surrounding
  45. 45The standard enthalpy of formation of , and are respectively. If all the substances are in standard state, the standard enthalpy of decompos18 May, 2023 (M)Laws of Thermochemistry and Enthalpy Change
  46. 46The number of extensive and intensive properties in the following list is respectively Mass, temperature, pressure, enthalpy, heat capacity,18 May, 2023 (E)System and surrounding
  47. 47If one litre of an ideal gas at a pressure of expands isothermally and reversibly to a final volume of ' ' by absorbing 92.12 L. atm heat, '18 May, 2023 (E)First Law and Basic Fundamentals of Thermodynamics
  48. 48If the enthalpy and entropy change for a reaction at are and respectively, which one of the following statements is correct?17 May, 2023 (M)Entropy and Second law of thermodynamics
  49. 4911.0 L of an ideal gas at constant external pressure of is compressed isothermally to a final volume of one liter. The heat absorbed and wor17 May, 2023 (M)First Law and Basic Fundamentals of Thermodynamics
  50. 50Among , the metal having lowest enthalpy of atomization is17 May, 2023 (M)Laws of Thermochemistry and Enthalpy Change

Frequently Asked Questions

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

This chapter includes 155 questions compiled from AP EAMCET papers spanning 2001 to 2025.

2.Are these questions only from AP EAMCET, or from other exams too?

These are AP EAMCET 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 AP EAMCET Chemistry?

Thermodynamics (C) has appeared in 25 of the 25 years of AP EAMCET papers covered here, with 155 questions across 89 papers - about 2 per paper it appears in.

4.What is the difficulty level of Thermodynamics (C) questions in AP EAMCET?

Of the 155 questions analysed for this chapter, 48% are easy, 50% moderate and 3% tough. 2022 had the most, with 22 questions.

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

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

  • Laws of Thermochemistry and Enthalpy Change - 56 questions (36%)
  • First Law and Basic Fundamentals of Thermodynamics - 43 questions (28%)
  • Third law of thermodynamics - 24 questions (15%)
  • Laws of Thermochemistry and Enthalpy Change has produced the most tough questions (2).
6.Is Thermodynamics (C)'s weightage in AP EAMCET going up or down?

Across all 89 papers analysed, Thermodynamics (C) has averaged about 1.7 questions per paper. In the last three years (2022–2024), that average has risen, at about 2.2 questions per paper. Use the year-wise numbers on this page for the exact trend before you decide how much time to give it.