A reddish brown sol is obtained by adding small quantity of FeCl3 solution to freshly prepared and well washed Fe(OH)3 ppt. Fixed layer and mobile layer are represented as

A reddish brown sol is obtained by adding small quantity of FeCl3 solution to freshly prepared and well washed Fe(OH)3 ppt. Fixed layer and mobile layer are represented as

  1. A

    FeCl3Fe3+:OH

  2. B

    Fe(OH)3Fe3+:Cl

  3. C

    Fe(OH)3Fe3+:3Cl

  4. D

    FeCl3Fe3+:3OH

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    Solution:

    Fe(OH)3 sol adsorbs common ion of FeCl3 and Fe(OH)3 from FeCl3, i.e. Fe3+ and positively charged sol is the fixed part of the electrical double layer. Thus, Cl- (to balance charge of Fe3+) ions are on the mobile part of the electrical double layer.

    Fe(OH)3Fe3+      3Cl Fixed     Mobile 

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