During electrophoresis of colloidal sol of $F e (O H)_{3}$ , the colloidal particles _________.

Move towards anode and cathode both

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Move towards cathode

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Move towards anode

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Do not move

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Solution

The correct option is C Move towards cathode
The colloidal sol of $F e (O H)_{3}$ has positive charge due to the preferential adsorption of ferric ions $(F e^{3 +})$ on the surface of the ferric hydroxide particles.
$F e (O H)_{3} + F e^{3 +} \to F e (O H)_{3} \cdot F e^{3 +}$
Hence, during electrophoresis of colloidal sol of $F e (O H)_{3}$ , the colloidal particles move towards cathode (negatively charged electrode).

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