Question

For an ideal solution, volume of mixing is ...........

• A. Negative
• B. Infinity
• C. Zero
• D. Fractional

Hint:

In an ideal solution, both the enthalpy and volume of mixing are zero due to uniform intermolecular interactions.

Answer 1

The Correct Option is C

An ideal solution is one that obeys Raoult’s Law over the entire range of concentrations. In such a solution, the interactions between unlike molecules are the same as those between like molecules.
As a result, there is no change in volume when the components are mixed — the total volume is equal to the sum of the volumes of the individual components.
Therefore, the volume of mixing for an ideal solution is zero.
This is a key thermodynamic property used to distinguish ideal from non-ideal solutions, where volume changes and enthalpy changes are expected.