The most effective coagulating agent among the following for `Sb_2S_3` sol is

Options

A. `Na_2SO_4`
B. `Al_2(SO_4)_3`
C. `NH_4Cl`
D. `NaCl`

Answer

B

Explanation

`Sb _2S_3` is a negative sol, means negative charge is spread over the surface of `Sb_2S_3` molecules. Thus, positive ions, having high charge density can easily coagulate them. Since, `Al_2(SO_4)_3` has highest positive charge density over `Al^(3+)` ions. Thus, `Al_2(SO_4)` is most effective coagulating agent for `Sb_2S_3` sol.