Which of the following has highest coagurating power for `As _(2)S_(3)` sol ?

Options

A. `SO _(4) ^(2-)`
B. `Al ^(3+)`
C. `PO_(4) ^(3-)`
D. `K^(+).`

Answer

B

Explanation

`As _(2) S _(3)` is a negatively charged sol so the flocculation of this sol will depend upon the high charge of cations, So, highest coagulating power will be of `AL ^(3+)` ions.