Question

The cause of Brownian movement which is not shown by true solutions or suspensions is due to:

• A. unbalanced bombardment of particles by molecules of the dispersion medium
• B. attractive forces between dispersed phase and dispersion medium
• C. larger size of the particles due to which they keep colliding and settling down
• D. conversion currents formed in the sol

Answer 1

The correct option is A unbalanced bombardment of particles by molecules of the dispersion medium

• Brownian motion is the continuous random movement of small particles suspended in a fluid, which arise from collisions with the fluid molecules.

• When colloidal solutions are viewed under a powerful ultramicroscope, the colloidal particles appear to be in a state of continuous zig-zag motion all over the field of view.

• This movement is nothing but a Brownian movement.
  

• Brownian movement is observed in colloids due to the unbalanced bombardment of the particles by the molecules of the dispersion medium.
  

• As true solutions or suspensions lack this property and hence Brownian movement is not observed.