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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

Please do not use chat terms. Example: avoid using "grt" instead of "great".

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  1. When liquid and vapour phases of one component system are in equilibrium (at a given temperature and…
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  3. The most important application of distribution law is in
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  10. Heat evolved/absorbed during conversion of a substance from one allotropic form to another is termed…
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  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
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  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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