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in Surface Chemistry by (43.7k points)
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Explain what is observed when.

1. KCl, an electrolyte, is added to an hydrated ferric hydroxide sol.

2. An electric current is passed through a colloidal solution.

3. A beam of light is passed through a colloidal solution.

1 Answer

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1. Feme hydroxide Fe(OH)3 is a positively charged sol, so it gets coagulated by the chloride ions released from KCI solution. 

2. When an electric current is passed through a colloidal solution due to charge on the colloidal particles they migrate towards the oppositely charged electrode. 

3. When a beam of light is passed through a colloidal solution the path of light becomes visible.

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