NEET Chemistry Surface Chemistry Questions Solved

When FeCl3 solution is added to NaOH a negatively charged sol is obtained. It is due to the

(A) Presence of basic group

(B) Preferential adsorption of OH ions

(C) Self dissociation

(D) Electron capture by sol particles 

(B).  FeCl2+3NaOH           FeOH3+3NaCl

         NaOH             Na++OH-

        OH ions having similarity with Fe(OH)3 will be adsorbed on the surface of Fe(OH)3 to form

        an electrical double layer. 


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