Question

Which one of the following substances gives a positive charged sol?

• A. Gold
• B. A metal sulphide
• C. Ferric hydroxide
• D. An acidic dye

Answer 1

Answer: (C)

Ferric hydroxide

Answer 2

${Fe(OH)_3}$ particles absorb ${Fe^{3+}}$ ions and get peptized to give a positively charged sol.