Answer:
(i)
The milk sample was illuminated because milk is a colloidal solution and hence,
scatter the light passing through it. The phenomenon observed is called "Tyndall
effect". (1+1)
(ii) As salt solution is a true solution i.e., solute particle size is
too small to scatter the light, so it does not show "Tyndall effect".
(2)
(iii) Examples of colloid Gold sol, arsenius sulphide (1/2+1/2)
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