Question

Benzene and naphthalene form an ideal solution at room temperature. For this process, the true statement(s) is (are)
(i) $\Delta G$ is positive
(ii) $\Delta S_{system}$ is positive
(iii) $\Delta S_{surroundmgs = 0}$
(iv) $\Delta H = 0$

• A. (ii) and (iv) only
• B. (i) and (iii) only
• C. (ii), (iii) and (iv) only
• D. all of these

Answer 1

Answer: (C)

For an ideal solution,
(i) $\Delta G < 0$; for mixing
(ii) $\Delta S_{system} > 0$; because disorder increases
(iii) $\Delta S_{surr} = 0$; no heat is exchanged in case of ideal solution.
(iv) $\Delta H_{mix} = 0$