Question

Which of the following condition(s) is/are valid for an ideal solution?

• A. No change in volume on mixing. $\Delta V_{mix}=0$
  
• B. No change in enthalpy on mixing. $\Delta H_{mix}=0$
• C. No change in entropy on mixing $\Delta S_{mix}=0$
• D. Ionisation of solute occurs to a small extent.

Answer 1

Answer: (A), (B)

No change in enthalpy on mixing. $\Delta H_{mix}=0$

Ideal solutions:
Solvent-solute interaction is equal to solvent-solvent and solute-solute interactions. There should be no association or dissociation of solute.
$\Delta S_{mix}>0$
$\Delta V_{mix}=0$
$\Delta H_{mix}=0$
Ideal solutions follow Raoult's Law.