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Chemistry - Thermodynamics (C)

Practise 51 KCET previous year questions on Thermodynamics (C), compiled from papers spanning 2007 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 KCET tests.

Thermodynamics (C) has been asked in 18 of the 20 years of KCET papers analysed (2007–2026), with 51 questions in all. 45% of them were easy, 47% moderate and 8% tough. Most of its questions came from 2011, with 6 questions that year. In the last three years (2024–2026) it had 7 questions across 3 papers, about 2.3 per paper.

The chapter's 5 topics are not weighted equally: Laws of Thermochemistry and Enthalpy Change (19 questions, 37%), Entropy and Second law of thermodynamics (13 questions, 25%), and Third law of thermodynamics (9 questions, 18%) have been asked the most. Over the last five years the most frequent topics have been First Law and Basic Fundamentals of Thermodynamics (4), Laws of Thermochemistry and Enthalpy Change (3), and System and surrounding (1). Laws of Thermochemistry and Enthalpy Change has produced the most tough questions (4).

  1. 1A: Entropy of a perfect crystalline solid at absolute zero approaches zero. B: For spontaneity of a reaction, . Among the two statements giv2026Third law of thermodynamics
  2. 2Which of the following is a correct statement for a thermodynamic system?2026System and surrounding
  3. 3A gas can be taken from A to B via two different paths ACB and ADB. When path ACB is used, J of heat flows into the system and J of work is 2026First Law and Basic Fundamentals of Thermodynamics
  4. 4Given below are two statements. Statement-I : Adiabatic work done is positive when work is done on the system and internal energy of the sys2025First Law and Basic Fundamentals of Thermodynamics
  5. 5Which one of the following reactions has ?2025First Law and Basic Fundamentals of Thermodynamics
  6. 6Identify the incorrect statements among the following: (a) All enthalpies of fusion are positive (b) The magnitude of enthalpy change does n2025Laws of Thermochemistry and Enthalpy Change
  7. 7From the diagram for the reaction, is2024Laws of Thermochemistry and Enthalpy Change
  8. 8Lattice enthalpy for is and . Enthalpy of solution of is2023Laws of Thermochemistry and Enthalpy Change
  9. 9The work done when 2 moles of an ideal gas expands reversibly and isothermally from a volume of to at is2022First Law and Basic Fundamentals of Thermodynamics
  10. 10Bond enthalpies of and are in the ratio . If bond enthalpy of formation of is . The bond enthalpy of is2021Entropy and Second law of thermodynamics
  11. 11When the same quantity of heat is absorbed by a system at two different temperatures and , such that , change in entropies are and respectiv2020Entropy and Second law of thermodynamics
  12. 12The reaction in which \( {H}> {U} \) is2019Laws of Thermochemistry and Enthalpy Change
  13. 13If the bond energies of \( {H}- {H}, {Br}- {Br} \) and \( {H}- {Br} \) are \( 433,192 \) and \( 364 {~kJ} {~mol}^{-1} \) respectively, then 2016Laws of Thermochemistry and Enthalpy Change
  14. 14The correct statement regarding entropy is,2016Third law of thermodynamics
  15. 15Adenosine is an example of2015Laws of Thermochemistry and Enthalpy Change
  16. 16In the reaction \( {S}+ {3}{2} {O}_{2} {SO}_{3}+2 {kJ} \) and \( {SO}_{2}+ {1}{2} {O}_{2} {SO}_{3}+y {~kJ} \) heat of formation of \( {SO}_{2015Laws of Thermochemistry and Enthalpy Change
  17. 17Which of the following compound possesses the " \( {C}- {H} \) " bond with the lowest bond dissociation energy?2015Laws of Thermochemistry and Enthalpy Change
  18. 18For hydrogen - oxygen fuel cell at one atm and \( 298 {~K} \) \( {H}_{2}(g)+ {1}{2} {O}_{2(g)} {H}_{2} {O}(l) ; {G}^{ }=-240 {~kJ} \) \( {E}2014Laws of Thermochemistry and Enthalpy Change
  19. 19\( A(g) { }{ } P(g)+Q(g)+R(g) \), follows first order kinetics with a half life of \( 69.3 {~s} \) at \( 500^{ } {C} \). Starting from the g2014Third law of thermodynamics
  20. 20Given thermochemical equation, . Heat of decomposition of water is2013Laws of Thermochemistry and Enthalpy Change
  21. 21The process is spontaneous at the given temperature, if2013Third law of thermodynamics
  22. 22The value of entropy of solar system is2013Third law of thermodynamics
  23. 23Which of the following statements is true?2012Entropy and Second law of thermodynamics
  24. 24A gas expands from a volume of to a volume of against an external pressure of . The work done by the gas will be2012First Law and Basic Fundamentals of Thermodynamics
  25. 25During the adsorption of a gas on the surface of a solid, which of the following is true?2012Third law of thermodynamics
  26. 26Generally, the first ionisation energy increases along a period. But there are some exceptions. The one which is not an exception is2011Laws of Thermochemistry and Enthalpy Change
  27. 27The amount of heat evolved when of is mixed with of is2011Laws of Thermochemistry and Enthalpy Change
  28. 28The enthalpy of vaporization of benzene is at its boiling point, . The entropy change in the transition of vapour to liquid at its boiling p2011Laws of Thermochemistry and Enthalpy Change
  29. 29Based on the first law of thermodynamics, which one of the following is correct?2011First Law and Basic Fundamentals of Thermodynamics
  30. 30During the adsorption of krypton on activated charcoal at low temperature2011Entropy and Second law of thermodynamics
  31. 31For the reversible reaction, , which one of the following statements is true?2011Entropy and Second law of thermodynamics
  32. 32Enthalpy of vaporization of benzene is at its boiling point, . The entropy change in the transition of the vapour to liquid at its boiling p2010Entropy and Second law of thermodynamics
  33. 33For the reversible reaction. Which one of the following statements is true?2010Entropy and Second law of thermodynamics
  34. 34The amount of heat evolved when of is mixed with of is2010Laws of Thermochemistry and Enthalpy Change
  35. 35Generally, the first ionization energy increases along a period. But there are some exceptions. One which is not an exception is2010Laws of Thermochemistry and Enthalpy Change
  36. 36Based on the first law of thermodynamics, which one of the following is correct?2010First Law and Basic Fundamentals of Thermodynamics
  37. 37For the reaction at and 1 atm pressure2009Entropy and Second law of thermodynamics
  38. 38The correct order of ionisation energy of , is2009Laws of Thermochemistry and Enthalpy Change
  39. 39The enthalpy of formation of is . The enthalpy change for the reaction is2009Laws of Thermochemistry and Enthalpy Change
  40. 40One mole of which of the following has the highest entropy?2008Entropy and Second law of thermodynamics
  41. 41If one mole of ammonia and one mole of hydrogen chloride are mixed in a closed container to form ammonium chloride gas, then2008Entropy and Second law of thermodynamics
  42. 42The correct order in which the first ionisation potential increases is2008Laws of Thermochemistry and Enthalpy Change
  43. 43The reagent used to convert an alkyne to alkene is2008Third law of thermodynamics
  44. 44When compared to for the formation of , the for the formation of is2008Third law of thermodynamics
  45. 45Consider the Born-Haber cycle for the formation of an ionic compound given below and identify the compound ( ) formed.2008Laws of Thermochemistry and Enthalpy Change
  46. 46Which of the following is an intensive property?2007System and surrounding
  47. 47In equilibrium state the value of is2007Third law of thermodynamics
  48. 48Entropy of the universe is2007Entropy and Second law of thermodynamics
  49. 49The relation between and is2007First Law and Basic Fundamentals of Thermodynamics
  50. 50In which of the following process, maximum increase in entropy is observed?2007Entropy and Second law of thermodynamics

Frequently Asked Questions

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

This chapter includes 51 questions compiled from KCET papers spanning 2007 to 2026.

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

These are KCET 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 KCET Chemistry?

Thermodynamics (C) has appeared in 18 of the 20 years of KCET papers covered here, with 51 questions across 18 papers - about 3 per paper it appears in.

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

Of the 51 questions analysed for this chapter, 45% are easy, 47% moderate and 8% tough. 2011 had the most, with 6 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 - 19 questions (37%)
  • Entropy and Second law of thermodynamics - 13 questions (25%)
  • Third law of thermodynamics - 9 questions (18%)
  • Laws of Thermochemistry and Enthalpy Change has produced the most tough questions (4).
6.Is Thermodynamics (C)'s weightage in KCET going up or down?

Across all 18 papers analysed, Thermodynamics (C) has averaged about 2.8 questions per paper. In the last three years (2024–2026), that average has fallen, at about 2.3 questions per paper. Use the year-wise numbers on this page for the exact trend before you decide how much time to give it.