Question

A solution containing components $A$ and $B$ follows Raoult's law when

• A. $A-B$ attraction force is greater than $A-A$ and $B-B$
• B. $A-B$ attraction force is less than $A-A$ and $B-B$
• C. $A-B$ attraction force remains same as $A-A$ and $B-B$
• D. volume of solution is different from sum of volumes of solute and solvent.

Answer 1

Answer: (C)

Raoult's law is valid for ideal solutions only. The element of non-ideality enters into the picture when the molecules of the solute and solvent effect each others intermolecular forces. A solution containing components of $A$ and $B$ behaves as an ideal solution when $A-B$ attraction force remains same as $A-A$ and $B-B$.