Question

In Brownian movement or motion, the paths of the particles are:
A. linear
B. zig-zag
C. uncertain
D. curved

Answer 1

Colloid is a substance microscopically dispersed throughout another substance. They can be settled by the process of centrifugation. Colloids have some mechanical properties like Brownian movement which is due to the unequal movements of moving molecules of dispersion medium on colloidal particles.

Complete step by step answer:
Colloids are dispersions where dispersed particles are distributed uniformly in the dispersion medium. Characteristics of dispersed phase are particle size, shape, surface area and surface charge. Colloids are classified into different types based on the different phase in dispersion medium and dispersed phase and nature of interaction between dispersed phase and dispersion medium.
There are different kinds of properties of colloids. They are:
-Optical properties
-Mechanical properties or kinetic properties
-Electrical properties
Mechanical or kinetic properties of colloids include Brownian movement, diffusion, osmotic pressure, sedimentation and viscosity.
Brownian movement is defined as the zig-zag motion of colloidal particles continuously and randomly. This arises due to the uneven distribution of collisions between colloid particles and the solvent molecule. It was more rapid for smaller particles. It decreases with increase in the viscosity of the medium.
Thus, the option B is correct.
Additional information:
In the kinetic properties, diffusion is the movement of particles from higher concentration to lower concentration until the concentration is uniform throughout.

Note:
The continuous zig-zag movement of the colloidal particles in the dispersion medium in a colloidal solution is called Brownian movement. It decreases with an increase in the size of colloidal particles. This is why suspensions do not exhibit this type of movement.