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Chemistry - Thermodynamics (C)

Practise 23 NEST (NISER) previous year questions on Thermodynamics (C), compiled from papers spanning 2011 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 NEST (NISER) tests.

Thermodynamics (C) has been asked in 14 of the 16 years of NEST (NISER) papers analysed (2011–2026), with 23 questions in all. 4% of them were easy, 70% moderate and 26% tough. Most of its questions came from 2024, with 4 questions that year. In the last three years (2024–2026) it had 6 questions across 4 papers, about 1.5 per paper.

The chapter's 4 topics are not weighted equally: First Law and Basic Fundamentals of Thermodynamics (9 questions, 39%), Third law of thermodynamics (6 questions, 26%), and Entropy and Second law of thermodynamics (6 questions, 26%) 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 (3), and Entropy and Second law of thermodynamics (2). First Law and Basic Fundamentals of Thermodynamics has produced the most tough questions (3).

  1. 1Consider a reversible thermodynamic process involving one mole of ideal gas represented by a line on the diagram connecting two states X ( b2026First Law and Basic Fundamentals of Thermodynamics
  2. 2The Gibbs free energy G for a liquid is considered as a function of temperature and pressure is plotted either as a function of temperature 2025Third law of thermodynamics
  3. 3Certain amount (say, n moles) of a monoatomic ideal gas of volume , temperature , and pressure is expanded against a constant external press2024 (Session 1)Entropy and Second law of thermodynamics
  4. 4For the chemical reaction , the standard free energy change is denoted by . For positive , the correct statement is2024 (Session 2)Third law of thermodynamics
  5. 5Consider n moles of an ideal gas undergoing a cyclic process as shown below. The correct option is2024 (Session 2)First Law and Basic Fundamentals of Thermodynamics
  6. 6Solubility of a solute in some solvent is assumed to be expressed using an Arrhenius type equation where the activation energy is replaced b2024 (Session 2)Laws of Thermochemistry and Enthalpy Change
  7. 7A certain amount ( moles) of a monoatomic ideal gas changes from an initial state to a final state . Let , and represent the changes in inte2023 (Session 1)Laws of Thermochemistry and Enthalpy Change
  8. 8Consider the expansion of one mole of an ideal gas from an initial state to a final state, with representing the entropy change in the proce2022 (Session 1)Entropy and Second law of thermodynamics
  9. 9The correct statement regarding the free energy change and the standard free energy change for (i) melting of ice and (ii) a chemical reacti2022 (Session 1)Third law of thermodynamics
  10. 10A certain amount of an ideal gas is expanded against a constant external pressure of 1 atmosphere from an initial volume of 1 L to a final v2022 (Session 2)First Law and Basic Fundamentals of Thermodynamics
  11. 11A monoatomic ideal gas kept in a vessel fitted with a piston is expanded irreversibly from its initial state ( , at 300 K ) to the final sta2021 (Session 2)First Law and Basic Fundamentals of Thermodynamics
  12. 12The pressure-volume diagrams for some processes involving 1 mole of an ideal gas are indicated below The process is isothermal and irreversi2020 (Session 2)Entropy and Second law of thermodynamics
  13. 13Consider two states, A and B , of a thermodynamic system. Let Path 1 represent a reversible process for going from A to B , while Path 2 rep2019 (Session 1)First Law and Basic Fundamentals of Thermodynamics
  14. 14A thermally insulated vessel is partitioned into two compartments by a fixed diathermal (heat conducting) wall and each compartment contains2019 (Session 1)Entropy and Second law of thermodynamics
  15. 15A thermally insulated vessel is partitioned into two compartments by a rigid, movable, and frictionless diathermal (heat conducting) piston.2019 (Session 2)First Law and Basic Fundamentals of Thermodynamics
  16. 16Consider a cyclic process for a system. Among the following, the combination of steps that can never lead to this cyclic process is2018First Law and Basic Fundamentals of Thermodynamics
  17. 17Three separate reversible processes (1,2 and 3) are carried out with 1 mole of an ideal gas initially at STP. In these processes, the pressu2018First Law and Basic Fundamentals of Thermodynamics
  18. 18The three thermodynamic states and R . of a system are connected by the paths shown in the figure given on the right. The entropy change in 2017Entropy and Second law of thermodynamics
  19. 19One mole of an ideal mono-atomic gas is subjected to a cyclic process connecting the states and N as shown in the pressure - temperature dia2016First Law and Basic Fundamentals of Thermodynamics
  20. 20One mole of an ideal gas is expanded irreversibly from an initial pressure of 2 atm to a final pressure of 1 atm at a temperature of 300 K .2016Entropy and Second law of thermodynamics
  21. 21The value of for gaseous mercury at is . The vapour pressure of mercury at is (given, is the equilibrium constant in terms of partial pressu2014Third law of thermodynamics
  22. 22The change in Gibbs free energy of vapourisation of 1 mol of at 1 atm and is is the heat change at constant2013Third law of thermodynamics
  23. 23The standard equilibrium constant is positive and follows the relation Choose the correct statement(s).2011Third law of thermodynamics

Frequently Asked Questions

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

This chapter includes 23 questions compiled from NEST (NISER) papers spanning 2011 to 2026.

2.Are these questions only from NEST (NISER), or from other exams too?

These are NEST (NISER) 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 NEST (NISER) Chemistry?

Thermodynamics (C) has appeared in 14 of the 16 years of NEST (NISER) papers covered here, with 23 questions across 17 papers - about one per paper it appears in.

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

Of the 23 questions analysed for this chapter, 4% are easy, 70% moderate and 26% tough. 2024 had the most, with 4 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 - 9 questions (39%)
  • Third law of thermodynamics - 6 questions (26%)
  • Entropy and Second law of thermodynamics - 6 questions (26%)
  • First Law and Basic Fundamentals of Thermodynamics has produced the most tough questions (3).
6.Is Thermodynamics (C)'s weightage in NEST (NISER) going up or down?

Across all 17 papers analysed, Thermodynamics (C) has averaged about 1.4 questions per paper. In the last three years (2024–2026), that average has stayed about the same, at about 1.5 questions per paper. Use the year-wise numbers on this page for the exact trend before you decide how much time to give it.