Liquid Activity Coefficient Models MCQ

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• What must be true for two coexisting liquid phases?
  ক

  YiL(1)xi(1) = YiL(2)xi(2)

  খ

  YiL(1)xi(1) = xi(2)

  গ

  YiL(1)xi(1)= YiL(2)yi(2)

  ঘ

  YiL(1)xi(1) = XiL(2)xi(2)
• How does the UNIQUAC model help?
  ক

  It helps to place calculations of activity coefficients on practical basis

  খ

  It helps to place calculations of activity coefficients on theoretical basis

  গ

  It helps to place calculations of activity coefficients from graph

  ঘ

  It helps to provide a easier way to place calculations
• What is the full form of NRTL model?
  ক

  No rational two liquid model

  খ

  Non-random three liquid model

  গ

  Non-random two liquid model

  ঘ

  Non-Rating two liquid model
• When is Wilson’s equation superior to Margules and Van laar equation?
  ক

  Non-ideal and immiscible mixtures

  খ

  Ideal and miscible mixtures

  গ

  Non-ideal and miscible mixtures

  ঘ

  Ideal and immiscible mixtures.
• What is the temperature dependence of van laar constant?
  ক

  Aij = A’ij/T

  খ

  Aij = A’ijR/T

  গ

  Aij = A’ij/TR

  ঘ

  Aij = A’ij*RT
• In Margules equation, what is the one constant form equivalent to?
  ক

  Unsymmetrical activity coefficient curves

  খ

  Symmetrical activity coefficient curves

  গ

  Similar partial fugacity coefficients

  ঘ

  Dissimilar partial fugacity coefficients
• Non-ideal solution effects can be incorporated in K-value formulations by:
  ক

  Integrating for each molecule

  খ

  Use of excess free energy

  গ

  Use of enthalpy of vaporization

  ঘ

  Use of partial fugacity coefficient ϕi
• For a regular solution model what is the excess molar free enrgy dependent upon?
  ক

  Volume occupied by molecules

  খ

  Interaction of molecules

  গ

  Molecular size and intermolecular forces

  ঘ

  Enthalpy of formation of molecules
• The relationship between excess molar free energy and excess molar enthalpy is:
  ক

  GE = hE – TSE

  খ

  GE = hE + TSE

  গ

  GE = – TSE

  ঘ

  GE = hE – T
• Which model is used for predicting liquid-phase activity coefficients?
  ক

  Entropy models

  খ

  Enthalpy models

  গ

  Gibb’s free equation model

  ঘ

  Keller model