A negatively charged sol of will not be coagulated by :

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Problem

A negatively charged sol of

[\text{AgI}]^-

will not be coagulated by : (1)

[\text{AgI}]^{\text{Ag}^+}

(sol) (2)

\text{FeCl}_3

(aq) (3)

[\text{As}_2\text{S}_3]^{2-}

(sol) (4)

\text{MgCl}_2