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Surface Chemistry — Chemistry STD 12 — Question

Tamilnadu BoardEnglish MediumSTD 12ChemistrySurface Chemistry3 Marks
Question
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.
✓

Answer

  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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