Explain what is observed when a colloidal solution of arsenious sulphide is treated as follows. i) An electrolyte is added to it. ii) A beam of light is passed through it. iii) It is brought under influence of electric field. PS:I want the answer asap ...please 

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On adding electrlyte it will precipitate down ..
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When a beam of light is passed through tge colloidal solution it will show tyndall effect
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And third part . It will undergo electrophoresis . In this the the particals near positive electrode acquire negative charge and vice versa . The apparatus is a U shaped tube with 2 Pt electrodes .
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