Answer:
(a) The milk sample was illuminated because milk is a
colloidal solution and its particles are big enough to scatter the light,
hence, they scatter the light passing through it. The phenomenon observed is
called "Tyndall effect".
(b) As salt solution is a true solution i.e., solute
particle size is too small to scatter the light, hence, it does not show
"Tyndall effect".
(c) Examples of colloid are gold sol, arsenius sulphide sol.,
Blood etc,
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