Which among the following is NOT true with respect to colloidal solution ?

According to NCERT Class 9 Science, a colloidal solution is a heterogeneous mixture, not a homogeneous one. While it may appear uniform to the naked eye (like milk), it consists of distinct phases: the dispersed phase and the dispersion medium.

• Option B is incorrect (and thus the right answer): Colloids are heterogeneous because the particles are large enough to be distinct from the solvent at a microscopic level.
• Option A: Particles are indeed spread uniformly, giving it a deceptive homogeneous appearance.
• Option C: Colloids exhibit the Tyndall effect, where particles are large enough to scatter a beam of light passing through them.
• Option D: Colloids are quite stable; the particles do not settle down when left undisturbed, unlike suspensions.