Thermodynamics is Unit 4 of NEET Chemistry and Chapter 5 of NCERT Class XI. This free practice test covers systems and surroundings, work, heat and internal energy, the first law, enthalpy and Hess's law, enthalpies of formation, combustion and atomisation, bond enthalpies, entropy, the second law, Gibbs energy and spontaneity, and the link between Gibbs energy change and the equilibrium constant. Each test has 15 NEET-pattern MCQs to finish in 15 minutes, with instant scoring and a full answer review. New question sets are published regularly, so you can retake the test as often as you like.