Question

Which one of the following is not correct for an ideal solution?

• A. \( It must obey Raoult's law. \)
• B. \( \Delta H = 0 \).
• C. \( \Delta H = \Delta V \neq 0 \).
• D. \( All are correct. \)

Hint:

An ideal solution shows no heat or volume changes upon mixing. Any deviation from this indicates a non-ideal solution.

Answer 1

The Correct Option is C

An ideal solution is defined by the following characteristics:
1. It obeys Raoult's law throughout the entire range of composition.
2. There is no heat change during mixing (\( \Delta H = 0 \)).
3. There is no volume change during mixing (\( \Delta V = 0 \)).
Option (3), which states that \( \Delta H = \Delta V \neq 0 \), is incorrect because both \( \Delta H \) and \( \Delta V \) must be zero for an ideal solution to behave ideally.
Final Answer: \[ \boxed{\Delta H = \Delta V \neq 0} \]