Which of the following statement is true about ideal solutions?

Both 1 and 2

The correct answer is option 3. Both 1 and 2.

In ideal solutions, both the volume of mixing and the enthalpy of mixing are zero.

(1) The volume of mixing is zero: In an ideal solution, when two components are mixed together, there is no significant change in volume compared to the sum of the individual volumes of the components. The molecules of the components fit together perfectly without any significant changes in the intermolecular spacing, resulting in no volume change upon mixing.

(2) The enthalpy of mixing is zero: In an ideal solution, there are no significant intermolecular forces or interactions between the components. The molecules of the components do not experience any energy changes when mixed together, resulting in no enthalpy change upon mixing.

Therefore, in ideal solutions, both the volume of mixing and the enthalpy of mixing are zero. Hence, the correct answer is (3) Both A and B.