Ideal Solution - Practice Questions & MCQ

Ideal solutions are the solutions in which solute-solute and solvent-solvent interactions are almost similar to solute-solvent interactions (A-B=A-A or B-B interactions) and such solutions satisfy the following requirements:

• They obey Raoult's law for all ranges of concentrations and temperature.
• ΔH(mix) = 0
• ΔV(mix) = 0
• Here (V.P)_obs = (VP)_exp
  (B.P)_obs = (B.P)_exp
  P_A = P_A^oX_A
  P_B = P_B^oX_B
  P_T = P_A + P_B
• No dissociation or association takes place here.
• No chemical reaction between solute and solvent.
• It does not form azeotrope.

For the solutions to follows the ideal solution at all ranges of concentrations and temperatures. then the molecular size of the liquids should be nearly the same. 
For example:

• CH₃OH + C₂H₅OH: Both these liquids are polar and have nearly the same size. Thus, this solution is an ideal solution.
• C₂H₅Br₂ + C₂H₅Cl₂: Both these liquids are polar and have nearly the same size. Thus, this solution is an ideal solution.
• C₂H₅Cl + C₂H₅Br: Both these liquids are polar and have nearly the same size. Thus, this solution is an ideal solution.
• C₆H₆ + C₆H₅CH₃: Both these liquids are non-polar and have nearly the same size. Thus, this solution is an ideal solution.
• C₂H₅Cl + C₂H₅I: Both these liquids are polar but the size difference between the molecules is large. Thus, this solution is not an ideal solution.