Answer:
Preparation of colloids
(a) Chemical
methods : In this method colloidal sols are prepared by oxidation, reduction,
hydrolysis and double decomposition.
(i)
(ii)
(iii)
(iv)
(b) Bredig's arc
method : In this method, electric arc is struck between electrodes of the metal
immersed in the dispersion medium. The intense heat produced vaporises
the metal,
which then condense to form particles of colloidal size.
(c) Peptization
: It is the process of converting precipitate into colloidal solution by
shaking it with dispersion medium in the presence of a small amount of
electrolyte.
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