Which of the following is the most effective in causing coagulation of ferric hydroxide sol?

Options

A. KCI
B. `KNO_(3)`
C. `K_(2)SO_(4)`
D. `K_(3)[Fe(CN)_(6)]`

Answer

D

Explanation

More the number of ions of a compound after dissociation causing most effective coagulation of ferric hydroxide solution.
`KCIhArrK^(+)+CI^(-)`
`KNO_(3)hArrK^(+)+NO_(3)^(-)`
`K_(2)SO_(4)hArr2K^(+)+SO_(4)^(2^-)`
`K_(3)[Fe(CN)_(6)]hArr3K^(+)+[Fe(CN)_(6)]^(3^-)`
Thus, `K_(3)[Fe(CN)_(6)]` has most effective in causing coagulation of ferric hydroxide solution.