Chemistry - Liquid Solution Question with Solution | TestHub

The final answer is A.

Explanation:

A. This statement is false. For solutions exhibiting negative deviations from Raoult's law, the intermolecular forces between solute and solvent are stronger than those between pure components. This can lead to a decrease in the total volume of the solution, meaning the volume of the solution can be less than the sum of the volumes of the pure solvent and solute. This phenomenon is known as volume contraction.

B. For an ideal solution, $\Delta G_{mix}=nRT\sum x_i\ln x_i$. Since $x_i<1$, $\ln x_i$ is negative, making $\Delta G_{mix}$ necessarily negative. This indicates a spontaneous mixing process.

C. An ideal binary solution obeys Raoult's law at all compositions. Azeotropes form due to significant positive or negative deviations from Raoult's law, where the vapor and liquid compositions become identical at a specific point. Therefore, an ideal solution cannot form an azeotropic mixture.

D. Ideal solutions are theoretical constructs where intermolecular interactions between all components are identical. In reality, some degree of difference in intermolecular forces always exists, making ideality an exception rather than a rule for binary solutions. Most real solutions exhibit some deviation from ideal behavior.