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| 1. |
Explain what is observed when a colloidal solution of arsenious sulphide is treated as follows:(i) A beam of light is passed through it (ii) An electrolyte is added to it (ii) It is brought under the influence of electric field. Give the name of the phenomenon in each case. |
| Answer» Solution : (i) The PATH of the light becomes VISIBLE and the PARTICLES can also be seen. (Tyndall effect) (ii) By adding excess of the ELECTROLYTE, the colloidal particles change to a yellow precipitate. (Coagulation) (iii) The colloidal particles migrate towards the anode INDICATING a negative charge on them. (Electrophoresis) | |