__________ does not change during phase transformation processes like sublimation, melting & vaporisation.

A. Entropy

B. Gibbs free energy

C. Internal energy

D. All (A), (B) & (C)

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  1. A solid is transformed into vapour without going to the liquid phase at
  2. For an ideal gas, the activity co-efficient is
  3. Which of the following is not an equation of state?
  4. At triple point (for one component system), vapour pressure of solid as compared to that of liquid will…
  5. Which of the following is not an intensive property?
  6. In an ideal gas mixture, fugacity of a species is equal to its
  7. Gibbs free energy of a pure fluid approaches __________ as the pressure tends to zero at constant temperature.
  8. The ratio of equilibrium constants (Kp2/Kp1) at two different temperatures is given by
  9. The following heat engine produces power of 100,000 kW. The heat engine operates between 800 K and 300…
  10. Joule-Thomson co-efficient which is defined as, η = (∂T/∂P)H = 1/Cp (∂H/∂T)P,…
  11. The expression for entropy change given by, ΔS = nR ln (V2/V1) + nCv ln (T2/T1) is valid for
  12. Specific/molar Gibbs free energy for a pure substance does not change during
  13. The necessary and sufficient condition for equilibrium between two phases is
  14. Degrees of freedom at triple point will be
  15. What is the ratio of adiabatic compressibility to isothermal compressibility?
  16. Entropy change for an irreversible process taking system and surrounding together is
  17. 1m3 of an ideal gas at 500 K and 1000 kPa expands reversibly to 5 times its initial volume in an insulated…
  18. Law of corresponding states says that
  19. Variation of equilibrium pressure with temperature for any two phases of a given substances is given…
  20. The partial molar enthalpy of a component in an ideal binary gas mixture of composition Z, at a temperature…
  21. If the internal energy of an ideal gas decreases by the same amount as the work done by the system,…
  22. An ideal liquid refrigerant should
  23. The enthalpy change when ammonia gas is dissolved in water is called the heat of
  24. COP of a refrigerator drawing 1 kW of power per ton of refrigeration is about
  25. An isentropic process is carried out at constant
  26. Ideal gas law is applicable at
  27. Pick out the wrong statement.
  28. Which of the following is not an extensive property?
  29. Reduced pressure of a gas is the ratio of its
  30. Third law of thermodynamics is concerned with the