Answer:
Colloidal solutions are generally
coloured on account of the scattering of light by the particles of the
dispersed phase i.e. colloidal particles. Since the particles present in
different colloidal solutions differ in sizes, they impart specific colours to
these solutions on passing light. The colour of the gold sol containing very
fine particles of gold is red. As the particle size increases, the colour of
solution changes to purple, blue and finally becomes golden yellow. As the particle
size changes, the wavelength of the scattered light also changes resulting in
different colours.
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