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Whate happens in the following activitie...

Whate happens in the following activities and why?
(i) An electrolyte is added to a hydrated ferric oxide sol in water.
(ii) A bean of light is passed through a colloidal solution.
(iii) An electric current is passed through a colloidal soluidal solution.

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Scattering of light by the colloidal particles takes place and the path of light becomes illuminated. This is called Tyndall effect.
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