Answer:
(a)
[1]
(b) (i) Sky appears blue in colour Dust particles along
with water suspended in air scatter blue light which reaches our eyes (in
visible range) and sky appears blue to us. [1]
(ii) When freshly prepared precipitate of is shaken
with there is
adsorption of ions
on the surface.
Thus, positively charged colloidal sol is formed. [1]
Thus,
Lyophilic colloids
Lyophobic colloids
Lyo-means liquid and philic-means loving (attracting).
Thus, these colloids have strong interactions with the dispersion medium.
These are stable and are also reversible colloids.
Lyo-means liquid and phobic means hating (liquid
hating). These are sparing soluble in liquid and do not pass readily into
colloidal state. Thus, they are less stable and irreversible.
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