Ideal Solutions follow Raoult's law over the entire range of concentrations.

• Characteristics: $\Delta H_{mix}=0$ and $\Delta V_{mix}=0$.
• Benzene and Toluene form a nearly ideal solution because they have similar molecular structures, sizes, and nearly identical intermolecular forces ($A-B$ interactions are similar to $A-A$ and $B-B$).
• Other pairs like Acetone-Chloroform show negative deviation (due to H-bonding between components), while Ethanol-Water shows positive deviation.