Question

Which of the following is true regarding ideal solutions?

• A. ${\Delta }_{\text{mix}}G>0$
• B. ${\Delta }_{\text{mix}}V>0$
• C. ${\Delta }_{\text{mix}}H=0$
• D. ${\Delta }_{\text{mix}}S=0$

Answer 1

The correct option is C ${\Delta }_{\text{mix}}H=0$

In an ideal solution, interaction between solute-solvent is the same as the solute-solute and solvent-solvent interactions. So the enthalphy of mixing of the two components is zero, i.e., ${\Delta }_{\text{mix}}H=0$ which signifies no heat is evolved or absorbed during the mixing of pure components.