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(D) When a dilute aqueous solution of $AgNO_3$ is added to an excess of dilute $KI$ solution,$AgI$ precipitate is formed. Since $KI$ is in excess,the

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$AgI / I^{-}$

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(D) When a dilute aqueous solution of $AgNO_3$ is added to an excess of dilute $KI$ solution,$AgI$ precipitate is formed. Since $KI$ is in excess,the $I^{-}$ ions are present in the dispersion medium. These $I^{-}$ ions are preferentially adsorbed on the surface of the $AgI$ particles,resulting in the formation of a negatively charged colloidal sol represented as $AgI / I^{-}$.

When a dilute $AgNO_3$ solution is mixed with excess of dilute $KI$,the colloidal solution formed is

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