Question

Which of the following colloidal solutions does not contain negatively charged particles?

• A. $Fe{\left(OH\right)}_3$
• B. ${As}_2{S}_3$
• C. Blood
• D. Gold sol

Answer 1

The correct option is A $Fe{\left(OH\right)}_3$

All metal hydroxide sols are positively charged due to preferential adsorption of positive metal ions. So from the give choices only $Fe(OH{)}_3$ is positivel charged due to adsoprion of $F{e}^{+3}$ ions and all remaining arenegative charged sols.