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Chemistry - Thermodynamics (C)

Practise 40 WBJEE previous year questions on Thermodynamics (C), compiled from papers spanning 2009 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 WBJEE tests.

Thermodynamics (C) has been asked in 17 of the 18 years of WBJEE papers analysed (2009–2026), with 40 questions in all. 53% of them were easy, 38% moderate and 10% tough. Most of its questions came from 2014, with 6 questions that year. In the last three years (2024–2026) it had 6 questions across 3 papers, about 2 per paper.

The chapter's 6 topics are not weighted equally: First Law and Basic Fundamentals of Thermodynamics (14 questions, 35%), Third law of thermodynamics (12 questions, 30%), and Entropy and Second law of thermodynamics (6 questions, 15%) have been asked the most. Over the last five years the most frequent topics have been Third law of thermodynamics (3), First Law and Basic Fundamentals of Thermodynamics (2), and System and surrounding (1). First Law and Basic Fundamentals of Thermodynamics has produced the most tough questions (4).

  1. 1Three engines A, B and C take steam at C and reject it at C, C and C respectively. The most efficient engine will be2026Carnot engine
  2. 2mole of an ideal gas undergoes the following processes: Process A Isothermal expansion at K from volume to volume , such that Process B Adia2026First Law and Basic Fundamentals of Thermodynamics
  3. 3Adiabatic free expansion of ideal gas must be2025First Law and Basic Fundamentals of Thermodynamics
  4. 4is an extensive property and is an intensive property of a thermodynamic system. Which of the following statement(s) is (are) correct?2025System and surrounding
  5. 5Which of the following statements is correct for a spontaneous polymerization reaction ?2024Third law of thermodynamics
  6. 6For a spontaneous process, the incorrect statement is2024Third law of thermodynamics
  7. 7At STP, the dissociation reaction of water is \( {H}_2 {O} {H}^{+}\)(aq.) \(+ {OH}^{-}\)(aq.), and the \( {pH}\) of water is 7.0. The change2023Third law of thermodynamics
  8. 8For a spontaneous reaction at all temperatures which of the following is correct?2021Third law of thermodynamics
  9. 9An ideal gas expands adiabatically against vaccum. Which of the following is correct for the given process?2020First Law and Basic Fundamentals of Thermodynamics
  10. 10For spontaneous polymerization, which of the following is (are) correct?2020Third law of thermodynamics
  11. 11For the equilibrium, which of the following is correct?2019Laws of Thermochemistry and Enthalpy Change
  12. 12At constant pressure, the heat of formation of a compound is not dependent on temperature, when2019First Law and Basic Fundamentals of Thermodynamics
  13. 13Identify the correct statement(s):2019First Law and Basic Fundamentals of Thermodynamics
  14. 14The heat of neutralisation of a strong base acid is . The heat released when 0.6 mole solution is added to a 0.25 mole of NaOH is2018Laws of Thermochemistry and Enthalpy Change
  15. 15During a reversible adiabatic process, the pressure of a gas is found to be proportional to the cube of its absolute temperature. The ratio 2018First Law and Basic Fundamentals of Thermodynamics
  16. 16Among the following, the extensive variables are2018System and surrounding
  17. 17Which of the following has the dimension if2017First Law and Basic Fundamentals of Thermodynamics
  18. 18The condition for a reaction to occur spontaneously is2016Third law of thermodynamics
  19. 19For the reaction. at , the values of and S are and 20 cal respectively. The value of for the reaction is2015Third law of thermodynamics
  20. 20For one mole of an ideal gas, the slope of vs. curve at constant pressure of 2 atm is L The value of the ideal universal gas constant 'R' in2014First Law and Basic Fundamentals of Thermodynamics
  21. 21The values of and of a certain reaction are and respectively. The temperature below which the reaction is spontaneous, is2014First Law and Basic Fundamentals of Thermodynamics
  22. 22The enthalpy of vaporisation of a certain liquid at its boiling point of is . The value of change in entropy for the process is2014Entropy and Second law of thermodynamics
  23. 23Given that . The heat of formation of carbon monoxide will be2014Laws of Thermochemistry and Enthalpy Change
  24. 24The value of for cooling 2 mole of an ideal monoatomic gas from to at constant pressure will be [given2014First Law and Basic Fundamentals of Thermodynamics
  25. 25For a spontaneous process, the correct statement(s) is (are)2014Entropy and Second law of thermodynamics
  26. 26The change of entropy is defined as2013Entropy and Second law of thermodynamics
  27. 27Mixing of two different ideal gases under isothermal reversible condition will lead to2013Entropy and Second law of thermodynamics
  28. 28Pressure-volume work done by an ideal gaseous system at constant volume is (where is internal energy of the system)2013First Law and Basic Fundamentals of Thermodynamics
  29. 29For isothermal expansion of an ideal gas, the correct combination of the thermodynamic parameters will be2013First Law and Basic Fundamentals of Thermodynamics
  30. 30The condition of spontaneity of a process is2013Third law of thermodynamics
  31. 31The standard Gibbs free energy change at for the dissociation of to is (given, equilibrium constant2013Third law of thermodynamics
  32. 32Identify the correct statement from the following in a chemical reaction.2012Third law of thermodynamics
  33. 33Which of the following is correct?2012Entropy and Second law of thermodynamics
  34. 34The amount of the heat released when \(20 {ml} 0.5 {M} {NaOH}\) is mixed with \(100 {ml} 0.1 {M} {HCl}\) is \( {x} {kJ}\). The heat of neutr2011Laws of Thermochemistry and Enthalpy Change
  35. 35A plot of In \( {k}\) against \( {1}{ {~T}}\) (abscissa) is expected to be a straight line with intercept on ordinate axis equal to2011Third law of thermodynamics
  36. 36Which of the following thermodynamic relation is correct?2010First Law and Basic Fundamentals of Thermodynamics
  37. 37The second law of thermodynamics says that in a cyclic process :2009Entropy and Second law of thermodynamics
  38. 38The equilibrium constant of a reaction may be written as :2009Third law of thermodynamics
  39. 39Equal volumes of molar hydrochloric acid and sulphuric acid are neutralised by dilute solution and and of heat are liberated respectively. W2009Laws of Thermochemistry and Enthalpy Change
  40. 40Under which of the following condition is the relation valid for a closed system?2009First Law and Basic Fundamentals of Thermodynamics

Frequently Asked Questions

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

This chapter includes 40 questions compiled from WBJEE papers spanning 2009 to 2026.

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

These are WBJEE 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 WBJEE Chemistry?

Thermodynamics (C) has appeared in 17 of the 18 years of WBJEE papers covered here, with 40 questions across 17 papers - about 2 per paper it appears in.

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

Of the 40 questions analysed for this chapter, 53% are easy, 38% moderate and 10% tough. 2014 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):

  • First Law and Basic Fundamentals of Thermodynamics - 14 questions (35%)
  • Third law of thermodynamics - 12 questions (30%)
  • Entropy and Second law of thermodynamics - 6 questions (15%)
  • First Law and Basic Fundamentals of Thermodynamics has produced the most tough questions (4).
6.Is Thermodynamics (C)'s weightage in WBJEE going up or down?

Across all 17 papers analysed, Thermodynamics (C) has averaged about 2.4 questions per paper. In the last three years (2024–2026), that average has fallen, at about 2.0 questions per paper. Use the year-wise numbers on this page for the exact trend before you decide how much time to give it.