CHEMICAL THERMODYNAMICS MCQs

By: Prof. Dr. Fazal Rehman | Last updated: May 23, 2025

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1. : Which is not an intensive property?



2. : _____ is the branch of chemistry that deals with the basic principles governing energy changes during numerous processes.



3. : ________ system is a system which can exchange energy as well as matter with its surroundings.



4. : A closed system is one which can exchange with surroundings:



5. : Which is not an extensive property?



6. : ∆H and ∆E are related as:



7. : In an isochoric process:



8. : Which is forever true for the adiabatic expansion of a gas?



9. : A process in which no heat/mass enters or leaves the system is called:



10. : The variation of enthalpy of reaction with temperature is given by:



11. : Internal energy does not include which of the following?



12. : Which statement is not related to applications and limitations of first law of thermodynamics?



13. : Which statement is not related with Joule-Thomson Effect?



14. : Which enthalpy is forever negative?



15. : Any property magnitude independent of the amount of substance present is called a/an:



16. : Regarding the internal energy of the molecules, which one of the following statement is not true?



17. : When two bodies have equality of temperature with a 3rd body, they in turn have equality of temperature with each other. This is a statement of:



18. : Which statement is not related with entropy?



19. : If T₁ and T₂ are the temperatures of the heat source and sink respectively, then the efficiency of the heat engine is defined as



20. : The efficiency of a reversible heat engine depends only on the



21. : Which statement is not true with respect to the second law of thermodynamics?



22. : The overall energy change during the Carnot cycle is



23. : Which process is not related with Carnot cycle?



24. : Which expression is true regarding entropy change of a reversible process?


25. : Which is not a state function?



26. : Which is true regarding the entropy of the universe?



27. : Which causes decrease in entropy?



28. : The condensation of any gas to a liquid is expected to have _____ and a _______.



29. : Total kinetic energy of a molecule of a gas is due to



30. : At constant T and P, the change in Gibbs free energy is represented by which of the following?



31. : Which does not represent the criterion of spontaneity of a reaction?



32. : At constant temperature, the decrease in Helmholtz free energy is equal to which of the following?



33. : At constant temperature and pressure, the decrease in Gibbs free energy (F) is equal to



34. : Enthalpy of food and fuel is measured by



35. : All naturally occurring processes proceed spontaneously in a direction that leads to



36. : In the bomb calorimeter, the reaction is carried out at which of the following?



37. : Which law of thermodynamics helps in calculating the absolute entropies of various substances?



38. : Which expression describes the exact relationship between standard free energy change and equilibrium constant?



39. : Which is the statement of third law of thermodynamics?



40. : If n₁ and n₂ represent moles of two components and µ₁ and µ₂ their chemical potentials respectively, then Gibbs-Duhem equation for this binary system is written as


41. : According to which law, the enthalpy change accompanying any physical or chemical transformation approaches zero as T approaches zero?



42. : Which statement is false regarding process of evaporation of a liquid?



43. : The link between classical thermodynamics and quantum mechanics is provided by which of the following laws?



44. : In statistical mechanics, there exists a function which contains all the information about a macroscopic system. This function is called _____ .



45. : Which has the highest value?



46. : In an adiabatic system, if work is done, the temperature must be _____.



47. : In which substance(s) ΔE = ΔH and no PV work?



48. : The heat flow of a system under isochoric conditions is a direct measurement of which of the following?



49. : According to Le-Chatelier’s principle, the addition of heat to the following reaction CO2 + 2H2O → CH4 + 2O2 will cause it to shift to right. The reaction can therefore be described as



50. : For the reaction CaCO3 → CaO + CO2, when taking place at higher temperature, which is true?



51. : At constant volume the heat of a reaction is represented by



52. : Which is true for adiabatic reversible process?



53. : ______ is the thermodynamic parameter, which is a state function and is measure of disorder of a system.



54. : One calorie is equivalent to



55. : The statement that heat cannot flow spontaneously from a colder to a hotter body is the result of which of the following?



56. : Internal energy of a given mass of an ideal gas depends upon



57. : Which provides physical significance of ΔF?



58. : For a spontaneous but endothermic process



59. : Use of thermometer is based on which law of thermodynamics?



60. : ΔG = ΔG°, when the reaction quotient (Q) is


61. : For a reversible process, what is the entropy change?


62. : At equilibrium the free energy change is


63. : Which is true for first law of thermodynamics?



64. : If ΔG is zero for a reaction then _____.



65. : Which occurs when a solid melts?



66. : Which makes the motion of perpetual motion machine a physical impossibility?



 

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