Brownian movement is more faster in true solutions than that in colloidal solutions.
The correct option is A True Brownian movement is due to the unequal bombardments of the moving molecules of dispersion medium on colloidal particles. The moving molecules of the dispersion medium continuously attack on colloidal particles from all sides and impart momentum to them. Since the chances of their collisions are unequal, the net driving force on a colloidal particles forces it to move a particular direction. As the particle moves in that direction, other molecules of the medium again collide with it and the particle changes its direction. The process continues. This results in a random zigzag movement of the colloidal particle.
The Brownian movement decreases with an increase in the size of colloidal particle. This is why, suspensions do not exhibit this type of movement and true solutions shows faster movements.