Question

Consider a binary mixture of volatile liquids.
For which of the following graph , solvent-solute interaction equal to that of solvent-solvent and the solute-solute interactions?

• A.
• B.
• C.
• D. None of the above

Answer 1

The correct option is A

Ideal solutions:
These solutions obey Raoult's law.
Here, the solvent-solute interaction are equal to that of solvent-solvent and the solute-solute interactions.
Option (a) :






Here,

$\text{Total pressure}=P_A+P_B$
Option (b) shows positive deviaition from Raoult's law. Here ,
$P_T>p_A^{\circ }{\chi }_A+p_B^{\circ }{\chi }_B$

Option (c) shows negative deviation from Raoult's law:
Here,
$P_T<p_A^{\circ }{\chi }_A+p_B^{\circ }{\chi }_B$