Which statement about colloids is false?

Dialysis is a process used to separate small solutes from larger particles, including colloids. The fundamental principle behind dialysis depends on the size of the particles; solutes, which are typically smaller, can pass through the semipermeable membrane, while colloids, being larger, cannot. Therefore, the statement that dialysis separates solutes from colloids correctly describes the interaction of these particles during the process.

In contrast, the other statements accurately characterize the behavior and properties of colloids. Colloids do not pass through semipermeable membranes because their particle size is larger than the pore sizes of these membranes, which is a critical distinction that underscores why the original statement is false. Colloids can indeed have an impact on freezing and boiling points, but this effect is typically less pronounced than that of true solutes, making the comparison in the correct answer valid. Additionally, the size of colloidal particles is indeed larger than the average wavelength of visible light, which accounts for the optical properties commonly associated with colloids, such as tyndall scattering.