Question

Benzene and napthalene form ideal solution at room temperature. For this process, the true statement(s) is(are):

• A. $\Delta G$ is positive
• B. $\Delta S_{system}$ is positive
• C. $\Delta S_{surrounding}=0$
• D. $\Delta H_{mix}=0$

Answer 1

Answer: (B), (C), (D)

$\Delta H_{mix}=0$

For an ideal solution,
$\left(i\right)\Delta G<0$; For mixing
$\left(ii\right)\Delta S_{system}>0$; because disorder increases
$\left(iii\right)\Delta S_{surrounding}=0$; No heat is exchaged in case of ideal solution
$\left(iv\right)$ $\Delta H_{mix}=0$