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

The following criteria define an ideal solution:
1. It adheres to Raoult's law across all compositions.
2. Mixing results in no heat alteration (\( \Delta H = 0 \)).
3. Mixing results in no volume alteration (\( \Delta V = 0 \)).
Statement (3), which posits \( \Delta H = \Delta V eq 0 \), is erroneous. For a solution to be considered ideal, both \( \Delta H \) and \( \Delta V \) must be zero.
Final Answer:\[\boxed{\Delta H = \Delta V eq 0}\]