Identify the negatively charged sol from following.

Step-by-step solution

The charge on colloidal particles arises from preferential ion adsorption, electron capture during electro-dispersion, or dissociation of surface molecules. Colloidal sols exhibit either positive or negative net charges: Negatively charged sols: Metal sulfides ( As₂S₃ , CdS ), acidic dyes (Eosin, Congo red), starch, gum, clay, charcoal, and metals ( Au , Ag , Pt ). Positively charged sols: Metal hydroxides ( Fe(OH)₃ , Al(OH)₃ ), basic dyes (Methylene blue), and haemoglobin under specific pH conditions. Analyzing th