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Explain what is observed (i) when a be...

Explain what is observed
(i) when a beam of light is passed through a colloidal sol.
(ii) an electrolyte, NaCI is added to hydrated ferric oxide sol.
(iii) electric current is passed through a colloidal sol.

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(i) Scattering of light by the colloidal particles takes place3 and the path of light becomes visible (Tyndall efect). (ii) The positively charged colloidal particles of `Fe(OH)_(3)` get conagulated by the oppositely charged `Cl^(-)` ions provided by naCl. (iii) On passing an electric current, colloidal particles move towerds charged oppositely chargbed electrode where they lose their charge and get coagulated.
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