Question

The most effective electrolyte, in the coagulation of a positively colloidal solution is:

• A. $K_4\left[Fe\right(CN{)}_6]$
• B. $FeC{l}_3$
• C. $MgS{O}_4$
• D. $AlB{r}_3$

Answer 1

The correct option is A $K_4\left[Fe\right(CN{)}_6]$

According to Hardy-Schulze Rule: Greater the valence of flocculating ion added, greater is its power to cause coagulation.
Among the given electrolytes, $K_4\left[Fe\right(CN{)}_6]$ have the higher valence anion $\left[Fe\right(CN{)}_6{]}^{4-}$

$\therefore$ Most effective electrolyte in coagulation of above solution is $K_4\left[Fe\right(CN{)}_6]$.