Question

A negatively charged sol of $[AgI{]}^{-}$ will not be coagulated by :

• A. $\left[AgI\right]A{g}^{+}\left(sol\right)$
• B. $\left[A{s}_2{S}_3\right]S^{2-}\left(sol\right)$
• C. $FeC{l}_3\left(aq\right)$
• D. $MgC{l}_2$

Answer 1

The correct option is B $\left[A{s}_2{S}_3\right]S^{2-}\left(sol\right)$

Negative sols are either coagulated by +ve sol or by electrolyte so $Ag{I}^{-}$ will not be coagulated by -ve ions.