Out of `BaCl_(2)` and KCl, which is more effective in causing coagulation of a negatively charged colloidal sol ? Give reason.

Explanation

`BaCl_(2)` is more effective in causing coagulation of negatively charged colloidal sol because greater the valency of the coagulating ion (oppoitely charged ion), greater is its power to bring about coagulation (`Ba^(2+)` has greter velency that `K^(+)`)