Describe a conspicuous change observed when
(i) a solution of NaCl is added to a sol. of hydrated
(ii) a beam of light is passed through a solution of
NaCl and then through a sol.
(i) Coagulation or precipitation of sol. takes place.
(ii) Scattering of light is observed when light is passed
through a sol. whereas no scattering of light is observed
in a solution of NaCl/ Tyndall effect in the sol.