In mechanical dispersion, the coarse suspension of the substance is brought into a colloidal state in the dispersion medium by grinding it in a

Options

A. colloid mill
B. ball mill
C. ultraviolet disintegrator
D. all of these

Answer

D

Explanation

Any of these could be used for mechanical dispersion which is one of the examples of dispersion method.
In dispersion method, large particles of the substance are broken into particles of colloidal dimension in the pressure of dispersion medium. These are stabilized by adding some suitable stabilizer.
The colloid mill consists of two metal discs, close together rotating at high speed (`7,000` revolutions per minute) in opposite directions. The suspension particles are torn off to the colloidal size.