Specific __________ does not change during a phase change (e.g. sublimation, melting, vaporisation etc.).

A. Entropy

B. Internal energy

C. Enthalpy

D. Gibbs free energy

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  1. Degree of freedom of a system consisting of a gaseous mixture of H2 and NH3 will be
  2. Lowering of condenser temperature (keeping the evaporator temperature constant) in case of vapour compression…
  3. Keeping the pressure constant, to double the volume of a given mass of an ideal gas at 27°C, the…
  4. A gas performs the maximum work, when it expands
  5. When a gas is expanded from high pressure region to low pressure region; temperature change occurs.…
  6. Clausius-Clapeyron equation is applicable to __________ equilibrium processes.
  7. Gibbs free energy (F) is defined as
  8. Out of the following refrigeration cycles, which one has the minimum COP (Co-efficient of performance)?
  9. In case of steady flow compression polytropic process (PVn = constant), the work done on air is the…
  10. Clausius-Clapeyron Equation gives accurate result, when the
  11. During the phase transition, __________ changes.
  12. Gases are cooled in Joule-Thomson expansion, when it is __________ inversion temperature.
  13. If the molar heat capacities (Cp or Cv) of the reactants and products of a chemical reaction are identical,…
  14. Critical solution temperature (or the consolute temperature) for partially miscible liquids (e.g., phenol-water)…
  15. A thermodynamic system is taken from state A to B along ACB and is brought back to A along BDA as shown…
  16. Degree of freedom of the system ice-watervapour will be
  17. In jet refrigerators, the refrigerating fluid is practically always
  18. Van Laar equation deals with the activity coefficients in
  19. Boiling of liquid is accompanied with increase in the
  20. The expression for the work done for a reversible polytropic process can be used to obtain the expression…
  21. The number of degree of freedom for an Azeotropic mixture of ethanol and water in vapourliquid equilibrium,…
  22. An isentropic process is carried out at constant
  23. Law of corresponding states says that
  24. __________ functions are exemplified by heat and work.
  25. Which of the following is not an extensive property?
  26. A domestic refrigerator has a/an __________ cooled condenser.
  27. Pick out the wrong statement.
  28. The following heat engine produces power of 100,000 kW. The heat engine operates between 800 K and 300…
  29. A refrigerator may be termed as a
  30. The most important application of distribution law is in