Question

For a solution showing positive deviation from raoult's law:

• A. Solvent-solute interaction is less than the solvent-solvent and the solute-solute interactions
• B. Enthalpy of mixing is greater than zero i.e. $\Delta H_{mix}>0$
• C. Entropy of mixing is greater than zero i.e. $\Delta S_{mix}>0$
• D. All of the above.

Answer 1

The correct option is D All of the above.

Positive deviation:
Solvent-solute interaction is less than the solvent-solvent and the solute-solute interactions

For positive deviation:

$\Delta H_{mix}>0$
$\Delta S_{mix}>0$
$\Delta G_{mix}<0$
Examples: Ethanol and Acetone, $C{S}_2$ and acetone