Question

Which of the following will have the highest coagulating power for the colloid $Fe(OH{)}_3$?

• A. $P{O}_4^{3-}$
• B. $S{O}_4^{2-}$
• C. $C{a}^{2+}$
• D. $A{l}^{3+}$

Answer 1

The correct option is A $P{O}_4^{3-}$

$Fe(OH{)}_3$ is a positive sol. Hence, greater the charge on anion, more is the coagulation power.