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Chemistry - Thermodynamics (C)

Practise 34 BITSAT previous year questions on Thermodynamics (C), compiled from papers spanning 2009 to 2024. Each question is pulled directly from the actual exam paper it appeared in, so you're practising in the exact style and difficulty BITSAT tests.

Thermodynamics (C) has been asked in 16 of the 16 years of BITSAT papers analysed (2009–2024), with 34 questions in all. 35% of them were easy, 44% moderate and 21% tough. Most of its questions came from 2024, with 6 questions that year. In the last three years (2022–2024) it had 10 questions across 6 papers, about 1.7 per paper.

The chapter's 5 topics are not weighted equally: Laws of Thermochemistry and Enthalpy Change (14 questions, 41%), First Law and Basic Fundamentals of Thermodynamics (8 questions, 24%), and Third law of thermodynamics (6 questions, 18%) have been asked the most. Laws of Thermochemistry and Enthalpy Change has also led over the last five years, with 6 questions. First Law and Basic Fundamentals of Thermodynamics has produced the most tough questions (3).

  1. 1The combustion of benzene (L) gives and . Given that heat of combustion of benzene at constant volume is at ; heat of combustion (in ) of be2024 (Memory Based Paper 1)Laws of Thermochemistry and Enthalpy Change
  2. 2Choose the correct option for free expansion of an ideal gas under adiabatic condition from the following:2024 (Memory Based Paper 1)First Law and Basic Fundamentals of Thermodynamics
  3. 3Which of the following relation is not correct?2024 (Memory Based Paper 2)Laws of Thermochemistry and Enthalpy Change
  4. 4The standard Gibbs energy for the following reaction is equilibrium constant2024 (Memory Based Paper 2)Third law of thermodynamics
  5. 5What would be the amount of heat absorbed in the cyclic process shown below?2024 (Memory Based Paper 3)First Law and Basic Fundamentals of Thermodynamics
  6. 6The bond dissociation energy of and are in the ratio of for the formation of is . The bond dissociation energy of will be2024 (Memory Based Paper 3)Laws of Thermochemistry and Enthalpy Change
  7. 7If enthalpies of formation of and at and pressure are 52,394 and respectively, the change in enthalpy for combustion of is equal to2023 (Memory Based Paper 1)Laws of Thermochemistry and Enthalpy Change
  8. 8Given that bond energies of and are and respectively and for is , bond enthalpy of is2023 (Memory Based Paper 2)Laws of Thermochemistry and Enthalpy Change
  9. 9Standard entropy of and are 60,40 and , respectively. For the reaction, , to be at equilibrium, the temperature will be2022Entropy and Second law of thermodynamics
  10. 10In an adiabatic process, no transfer of heat takes place between system and surrounding. Choose the correct option for free expansion of an 2022System and surrounding
  11. 11Work out the heat change (cal) when of He gas at undergoes isothermal and reversible compression from initial pressure of to .2021First Law and Basic Fundamentals of Thermodynamics
  12. 12For which one of the processes represented by the following equations the enthalpy (heat) change is likely to be negative2020Laws of Thermochemistry and Enthalpy Change
  13. 13Acyclicprocess ABCD is shown in P-V diagram for an ideal gas. Which of the following diagram represents the same process?2020First Law and Basic Fundamentals of Thermodynamics
  14. 14For the combustion reaction at Which of the following alternatives is correct?2020First Law and Basic Fundamentals of Thermodynamics
  15. 15The heat of reaction for C 10 H 8 s + 12 O 2 g 10 CO 2 g + 4 H 2 O ( l ) at constant volume is - 1228 . 2 kcal at 25 0 C . The heat of react2019Laws of Thermochemistry and Enthalpy Change
  16. 16Enthalpy of combustion of methane and ethane are - 210 k cal / mol and - 368 k cal / mol respectively. The enthalpy of combustion of decane 2018Laws of Thermochemistry and Enthalpy Change
  17. 17When the heat of a reaction at constant pressure is - 25 10 - 3 cal and entropy change for the reaction is 7 . 4 cal deg - 1 , it is predict2018Entropy and Second law of thermodynamics
  18. 18Which of the following reactions does not involve absorption of energy? I. O g + e - O - g II. S g + e - S - g III. O - g + e - O 2 - g IV. 2017Entropy and Second law of thermodynamics
  19. 19Which of the following show an increase in entropy? I. Boiling of water II. Melting of ice III. Freezing of water IV. Formation of hydrogen 2017Entropy and Second law of thermodynamics
  20. 20For a particular reversible reaction at temperature and were found to be both +ve. If is the temperature at equilibrium, the reaction would 2016Third law of thermodynamics
  21. 21Given (Electron gain enthalpy) Based on data provided, the value of electron gain enthalpy of fluorine would be:2016Laws of Thermochemistry and Enthalpy Change
  22. 22Which law of the thermodynamics helps in calculating the absolute entropies of various substances at different temperatures?2015Third law of thermodynamics
  23. 23A spontaneous reaction is impossible if2015Third law of thermodynamics
  24. 24The enthalpy of sublimation of aluminium is 330 . Its Ist, II and III ionization enthalpies are 580,1820 and respectively. How much heat has2014Laws of Thermochemistry and Enthalpy Change
  25. 25If the enthalpy of vaporization of water is 186.5 , the entropy if its vaporization will be:2014Entropy and Second law of thermodynamics
  26. 26The heats of neutralisation of , and are -13.2,-13.4,-2.9 and per equivalent respectively. Arrange the acids in increasing order of acidic s2014Laws of Thermochemistry and Enthalpy Change
  27. 27For the dissociation reaction, heat of atomisation of is2013Laws of Thermochemistry and Enthalpy Change
  28. 28The enthalpy of combustion of 2 moles of benzene at differs from the value determined in bomb calorimeter by2013Laws of Thermochemistry and Enthalpy Change
  29. 29In which of the following reactions, standard entropy change is positive and standard Gibb's energy change decreases sharply with increasing2012Third law of thermodynamics
  30. 30What is the free energy change, , when 1.0 mole of water at and 1 atm pressure is converted into steam at and . pressure?2011Third law of thermodynamics
  31. 31At a constant volume the specific heat of a gas is 0.075 and its molecular weight is The gas is:2010First Law and Basic Fundamentals of Thermodynamics
  32. 32Which one of the following is correct regarding2009First Law and Basic Fundamentals of Thermodynamics
  33. 33One mole of an ideal gas at is expanded isothermally from an initial volume of 1 litre to 10 litres. The for this process is cal2009First Law and Basic Fundamentals of Thermodynamics
  34. 34At and 1 bar which of the following has a non-zero2009Laws of Thermochemistry and Enthalpy Change

Frequently Asked Questions

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

This chapter includes 34 questions compiled from BITSAT papers spanning 2009 to 2024.

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

These are BITSAT 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 BITSAT Chemistry?

Thermodynamics (C) has appeared in 16 of the 16 years of BITSAT papers covered here, with 34 questions across 19 papers - about 2 per paper it appears in.

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

Of the 34 questions analysed for this chapter, 35% are easy, 44% moderate and 21% tough. 2024 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 - 14 questions (41%)
  • First Law and Basic Fundamentals of Thermodynamics - 8 questions (24%)
  • Third law of thermodynamics - 6 questions (18%)
  • First Law and Basic Fundamentals of Thermodynamics has produced the most tough questions (3).
6.Is Thermodynamics (C)'s weightage in BITSAT going up or down?

Across all 19 papers analysed, Thermodynamics (C) has averaged about 1.8 questions per paper. In the last three years (2022–2024), that average has stayed about the same, at about 1.7 questions per paper. Use the year-wise numbers on this page for the exact trend before you decide how much time to give it.