The change in Gibbs free energy for vaporisation of a pure substance is

A. Positive

B. Negative

C. Zero

D. May be positive or negative

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  1. When liquid and vapour phases of one component system are in equilibrium (at a given temperature and…
  2. Which of the following represents the Virial equation of state?
  3. The most important application of distribution law is in
  4. In the equation, PVn = constant, if the value of n is in between 1 and y (i.e. Cp/Cv), then it represents…
  5. Gibbs-Duhem equation relates composition in liquid phase and the __________ at constant temperature…
  6. As the temperature is lowered towards the absolute zero, the value of the quantity (∂ΔF/∂T)…
  7. Heat is added at constant pressure in an ideal __________ cycle.
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  10. Heat evolved/absorbed during conversion of a substance from one allotropic form to another is termed…
  11. For an ideal gas, the internal energy depends upon its __________ only.
  12. Free energy change at equilibrium is
  13. Mollier chart is a __________ plot.
  14. At equilibrium condition, the chemical potential of a material in different phases in contact with each…
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  16. Heat pump
  17. The extensive properties are
  18. An isentropic process is carried out at constant
  19. __________ functions are exemplified by heat and work.
  20. The standard state of a gas (at a given temperature) is the state in which fugacity is equal to
  21. Entropy of the system decreases, when
  22. Which of the following is not a common refrigerant?
  23. For a constant volume process
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  25. __________ explains the equilibrium constant for any chemical reaction.
  26. The thermodynamic law, PVy = constant, is not applicable in case of
  27. A two stage compressor is used to compress an ideal gas. The gas is cooled to the initial temperature…
  28. Pick out the correct equation relating 'F' and 'A'.
  29. (1/V) (∂V/∂T)P is the mathematical expression
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