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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) and electrolyte, NaCI is added to hydrated ferric oxide sol.
(iii) electric curret is passed through a colloidal sol.

Text Solution

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(i) Scattering of light by the colloidal particles takes and the path of light becomes visible (Tyndall effect)
(ii) The positively charged colloidal particles of `Fe(OH)_(3)` get coagulated by the oppositely charged `CI^(-)` ions provided by `NaCI`.
(iii) On passing electric current, colloidal particles move towards the oppositely charged electrode where they lose their charge and get coagulated.
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