Which of the following will have the highest coagulation power for Fe (OH)3 colloid?

Which of the following will have the highest coagulation power for Fe (OH)₃ colloid?

A
${PO}_{4}^{3 -}$
B
${SO}_{4}^{2 -}$
C
${Ca}^{2 +}$
D
${Al}^{3 +}$

Solution:

$Fe (OH)_{3}$ is a positive sol. Hence, greater the charge on anion more is the coagulation power.

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