What causes brownian motion in colloids? a. molecules of the dispersion medium colliding with dispersed phase particles b. coagulation of particles of the dispersed phase c. erratic flashes of light d. there is no brownian motion in colloids.

The correct answer is option A.

Explanation:

Brownian motion is a random motion of particles present in the fluid such as air or liquid.This motion of the particles  is due to collision with fast moving molecules in a fluid.

In colloids , molecules of dispersed phase are in motion due to the fast motion of dispersion medium's particle which imparts motion to these particles of dispersed phase by means of collision.

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