Question

Benzene and napthalene form an 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,
(a) $\Delta G<0$; for mixing.
(b) $\Delta S_{system}>0$, because randomness increases.
(c) $\Delta S_{surrounding}=0$
(d) $\Delta H_{mix}=0$; no heat is exchanged in case of ideal solution.