Question

Which of the following electrolytes is least effective in causing flocculation of ferric hydroxide sol?

• A. $K_{3}Fe{\left(CN\right)}_6$
• B. $K_{2}Cr{O}_4$
• C. $KBr$
• D. $K_{2}S{O}_4$

Answer 1

The correct option is C $KBr$

$KBr$ has least coagulating power due to lowest charge present on potassium bromide hence, maximum amount of $KBr$ is required to flocculate ferric hydroxide.