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| 1. |
Explain what is observed when ltbr. `a.` An electrolyte `NaCl` is added to hydrated ferric oxide sol. `b.` Electric current is passed through a colloidal sol. `c.` When a beam of light is passed through a collidal solution. |
| Answer» `a.` The positively charged colloidal particles of `Fe(OH)_(3)` get coagulated by the oppositely charged `Cl^(c-)` ions provided by `NaCl`. ltbr.` b.` On passing direct current , colloidal particles move towards the oppositely charged electrodes where they lose their charge and get coagulated. ltbr. `c`. Scattering of light by the colloidal particels takes place and the path of light becomes visible `(` Tyndall effect `)`. | |