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Explain what is observed : (i) When a beam of light is passed through a colloidal sol. (ii) An electrolyte, NaCl is added to hydrated ferric oxide sol. (iii) Electric current is passed through a colloidal sol ? |
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Answer» Solution :(i) When a light beam pass through colloidal sol, light is scattered this process is known as Tyndal EFFECT. The scattering of light illuminates the path. (II) When electrolyte `NaCl` is added to the aquous Ferric oxide sol, `NA^(+)` and Clions are removed from `NaCl` and coagulation of positive CHARGED ferric oxide is done in presence of negative charged `Cl^(-)` ion. (iii) Colloidal sols are either positive charged or negative charged dispersion medium has different charge. It made colloids neutral. Colloids are attracted towards positive charged electrodes, in presence of voltage and when they get connected to the electrodes they loose their charge and get coagulated. |
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