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Explain the following observations : (...

Explain the following observations :
(i) A beam of light passing through a colloidal solution has a visible path.
  (ii) Passing an electric current through a colloidal solution removes colloidal particles from it.
  (iii) Ferric hydroxide sol coagulates on addition of potassium sulphate,

Text Solution

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(i) This is due to scattering of light by the colloidal particles (called Tyndall effect)
  (ii) This is due to charge on the colloidal particles so that they migrate towards the oppositely, charge electrode.
  (iii) Ferric hydroxide is a positively charged sol and is coagulated by `SO_(4)^(2-)` ions given by `K_2 SO_4`.
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