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
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.
is shaken
with
there is
adsorption of
ions
on the
surface.
Thus, positively charged colloidal sol is formed. [1]
Thus,
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