A) \[AgI:\text{ }A{{g}^{+}}:NO_{3}^{-}\]
B) \[AgI:{{K}^{+}}:NO_{3}^{-}\]
C) \[AgI:\text{ }NO_{3}^{-}:A{{g}^{+}}\]
D) \[AgI:{{I}^{-}}:{{K}^{+}}\]
Correct Answer: D
Solution :
The Helmholtz double layer contains a layer of opposite charges on the surface of colloidal particles. \[AgN{{O}_{3}}+\underset{excess}{\mathop{KI}}\,\xrightarrow[{}]{{}}AgI+KN{{O}_{3}}\] \[AgI+KI\xrightarrow{{}}AgI:{{I}^{-}}:{{K}^{+}}\]
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