Question

Which of the following conditions are correct for real solutions showing negative deviation from Raoult's law?

• A. $\Delta H_{Mix} < 0 ; \Delta V_{Mix} > 0 $
• B. $\Delta H_{Mix} > 0 ; \Delta V_{Mix} > 0 $
• C. $\Delta H_{Mix} > 0 ; \Delta V_{Mix} < 0 $
• D. $\Delta H_{Mix} < 0 ; \Delta V_{Mix} < 0 $

Answer 1

Answer: (D)

Conditions that are correct for real solutions showing negative deviation from Raoult's law are as follows
$p_{A} < p_{A}{ }^{\circ} x_{A} \text { and } p_{B} < p_{A}^{\circ} X_{B}$
$ \Delta_{\operatorname{mix}} H=-\text { ve } $
Dissolution is exothermic heating decreases solubility
$\Delta_{\text {mixing }} V=-$ ve