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Chemistry - Thermodynamics (C)

Practise 61 AIIMS previous year questions on Thermodynamics (C), compiled from papers spanning 2001 to 2019. Each question is pulled directly from the actual exam paper it appeared in, so you're practising in the exact style and difficulty AIIMS tests.

Thermodynamics (C) has been asked in 19 of the 19 years of AIIMS papers analysed (2001–2019), with 61 questions in all. 57% of them were easy, 33% moderate and 10% tough. Most of its questions came from 2013, with 6 questions that year. In the last three years (2017–2019) it had 12 questions across 5 papers, about 2.4 per paper.

The chapter's 5 topics are not weighted equally: Laws of Thermochemistry and Enthalpy Change (22 questions, 36%), First Law and Basic Fundamentals of Thermodynamics (13 questions, 21%), and Entropy and Second law of thermodynamics (11 questions, 18%) have been asked the most. Laws of Thermochemistry and Enthalpy Change has produced the most tough questions (3).

  1. 1In isolated system, find the condition for spontaneous reaction.26 May, 2019Third law of thermodynamics
  2. 2Assertion : is a state function. Reason : is an intensive property.26 May, 2019System and surrounding
  3. 3At , when 1 mole of butane is heated, and liquid are formed, then the work done is25 May, 2019First Law and Basic Fundamentals of Thermodynamics
  4. 4Reaction, at is in equilibrium. If equilibrium constant and Gibbs' free energy for this reaction are and respectively, then the Gibbs' free 25 May, 2019Third law of thermodynamics
  5. 5Assertion : The graph between is a straight line. Reason : At constant temperature, .25 May, 2019First Law and Basic Fundamentals of Thermodynamics
  6. 61 mole of an ideal gas expands isothermally reversibly from 2 litre to 4 litre and 3 moles of the same gas expands from 2 litre to litre and27 May, 2018First Law and Basic Fundamentals of Thermodynamics
  7. 7What is the entropy change in , when its temperature is taken from to , at constant pressure?27 May, 2018Entropy and Second law of thermodynamics
  8. 8Assertion : Addition of and gives . Reason : Addition of two path functions cannot give state function.27 May, 2018System and surrounding
  9. 9If one monoatomic gas is expanded adibatically from to at external pressure then the value of (in atm ) is26 May, 2018First Law and Basic Fundamentals of Thermodynamics
  10. 10Which of the following are extensive properties?26 May, 2018System and surrounding
  11. 11The heat is liberated when of benzoic acid is burnt in a bomb calorimeter at and it increases the temperature of of water by . If the specif2017First Law and Basic Fundamentals of Thermodynamics
  12. 12Assertion : Spontaneous process is an irreversible process and may be reversed by some external agency. Reason : Decrease in enthalpy is a c2017Third law of thermodynamics
  13. 13The heat liberated when of benzoic acid is burnt in a bomb calorimeter at and it increases the temperature of of water by . If the specific 2016Laws of Thermochemistry and Enthalpy Change
  14. 14Assertion : A reaction which is spontaneous and accompanied by decrease of randomness must be exothermic. Reason : All exothermic reactions 2016Laws of Thermochemistry and Enthalpy Change
  15. 15Assertion : Heat of neutralisation for both and with is . Reason : Both and are strong acids.2016Laws of Thermochemistry and Enthalpy Change
  16. 16For the reaction of one mole of zinc dust with one mole of sulphuric acid in a bomb calorimeter, and correspond to2015Laws of Thermochemistry and Enthalpy Change
  17. 17A diatomic gas at pressure , compressed adiabatically to half of its volume, what is the final pressure?2014First Law and Basic Fundamentals of Thermodynamics
  18. 18Which thermodynamic parameter is not a state function?2013System and surrounding
  19. 19Energy of activation of forward reaction for an endothermic process is . If enthalpy change for forward reaction is then enthalpy change for2013Laws of Thermochemistry and Enthalpy Change
  20. 20Assertion : Bond dissociation energy is Reason : has more electronic repulsion than .2013Laws of Thermochemistry and Enthalpy Change
  21. 21Assertion : For an isolated system, is zero. Reason : In an isolated system, change in and is zero.2013System and surrounding
  22. 22Assertion : Entropy of system increases for a spontaneous reaction. Reason : Enthalpy of reaction always decreases for spontaneous reaction.2013Entropy and Second law of thermodynamics
  23. 23Assertion : A process is called adiabatic if the system does not exchange heat with the surroundings. Reason : It does not not involve incre2013First Law and Basic Fundamentals of Thermodynamics
  24. 24At equilibrium which is correct?2012Third law of thermodynamics
  25. 25Bond dissociation energy of is and is . Then bond dissociation energy of bond is2012Laws of Thermochemistry and Enthalpy Change
  26. 26The enthalpy of formation of and is and respectively. For the reaction, is2011Laws of Thermochemistry and Enthalpy Change
  27. 27For adiabatic process, which is correct?2011First Law and Basic Fundamentals of Thermodynamics
  28. 28Which of the following is not a thermodynamic function?2011First Law and Basic Fundamentals of Thermodynamics
  29. 29Which of the following is intensive property?2011System and surrounding
  30. 30Assertion : Entropy is always constant for a closed system. Reason : Closed system is always reversible.2011Entropy and Second law of thermodynamics
  31. 31and have the same crystal structure and approximately the same ionic radii. If is the lattice energy of , the approximate lattice energy of 2010Laws of Thermochemistry and Enthalpy Change
  32. 32Match List I with List II and select the correct answer using the codes given below the lists:2010Third law of thermodynamics
  33. 33Assertion : Bond energy and bond dissociation energy have identical value for diatomic molecules. Reason : Greater the bond dissociation ene2010Laws of Thermochemistry and Enthalpy Change
  34. 34In an isobaric process, when temperature changes from to is equal to2009Entropy and Second law of thermodynamics
  35. 35Assertion : Heat of neutralisation of nitric acid with is same to that of and . Reason : In both cases strong acid and strong bases are neut2009Laws of Thermochemistry and Enthalpy Change
  36. 36Assertion : A reaction which is spontaneous and accompanied by decrease of randomness must be exothermic. Reason : All exothermic reactions 2009Laws of Thermochemistry and Enthalpy Change
  37. 37Assertion : Many endothermic reactions that are not spontaneous at room temperature become spontaneous at high temperature. Reason : Entropy2008Entropy and Second law of thermodynamics
  38. 38Calculate change in internal energy if \( H=-92.2 {~kJ}, P=40 {~atm}\) and \( V=-1 {~L}\).2007First Law and Basic Fundamentals of Thermodynamics
  39. 39\( H_{ {fusion }}\) of a substance is ' \(x\) ' and \( H_{ {vap }}\) is ' \(y\) ', then \( H_{ {sublimation }}\) will be2007Laws of Thermochemistry and Enthalpy Change
  40. 40\( S_{ {surr }}\) for an exothermic reaction is2007Entropy and Second law of thermodynamics
  41. 41Assertion : As a salt such as \( {NaCl}\) dissolves, the \( {Na}^{+}\)and \( {Cl}^{-}\)ions leaving the crystal lattice acquire far greater 2007Third law of thermodynamics
  42. 42For a spontaneous process the correct statement is2006Entropy and Second law of thermodynamics
  43. 43For a phase change (l) (s)2006Entropy and Second law of thermodynamics
  44. 44The enthalpy change for the reaction, is at . The internal energy change at is2006First Law and Basic Fundamentals of Thermodynamics
  45. 45Assertion : Water in liquid state is more stable than ice at room temperature. Reason : Water in liquid form has higher entropy than ice.2006Entropy and Second law of thermodynamics
  46. 46of methanol is given by the chemical equation2005Laws of Thermochemistry and Enthalpy Change
  47. 47For the reaction of one mole of zinc dust with one mole of sulphuric acid in a bomb calorimeter, and corresponds to2005Laws of Thermochemistry and Enthalpy Change
  48. 48How much energy is released when 6 moles of octane is burnt in air? Given for and respectively are and .2004Laws of Thermochemistry and Enthalpy Change
  49. 49For the equilibrium at 1 atm and ,2004Third law of thermodynamics
  50. 50Assertion : Molar entropy of vaporisation of water is different from ethanol. Reason : Water is more polar than ethanol.2004Entropy and Second law of thermodynamics

Frequently Asked Questions

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

This chapter includes 61 questions compiled from AIIMS papers spanning 2001 to 2019.

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

These are AIIMS questions specifically for the Thermodynamics (C) chapter. Questions from other exams like NEET or JIPMER are organised separately under their respective exam sections.

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

Thermodynamics (C) has appeared in 19 of the 19 years of AIIMS papers covered here, with 61 questions across 21 papers - about 3 per paper it appears in.

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

Of the 61 questions analysed for this chapter, 57% are easy, 33% moderate and 10% tough. 2013 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 - 22 questions (36%)
  • First Law and Basic Fundamentals of Thermodynamics - 13 questions (21%)
  • Entropy and Second law of thermodynamics - 11 questions (18%)
  • Laws of Thermochemistry and Enthalpy Change has produced the most tough questions (3).
6.Is Thermodynamics (C)'s weightage in AIIMS going up or down?

Across all 21 papers analysed, Thermodynamics (C) has averaged about 2.9 questions per paper. In the last three years (2017–2019), that average has fallen, at about 2.4 questions per paper. Use the year-wise numbers on this page for the exact trend before you decide how much time to give it.