Comment on whether each of the following statements is true or false, and briefly explain your answer.

1. If two components were mixed to form an ideal solution DmixS <0

2. The benzene-toluene system obeys Raoult's law because benzene and toluene molecules have similar shapes and electronic structures

3. For the non-electrolyte solution the solute obeys Henry's law and solvent obeys Raoult's law

4. The partial molar volume of a substance varies with composition in a mixture and can have negative or a positive value.

5. For non-ideal solution the vapour pressure of the solution will be greater than the sum of the vapour pressures for an ideal solution if the interaction between solute and solvent molecules are stronger than interactions between themselves.