1.

When an excess of a very dilute aqueous solution of KI is added to a very dilute aqueous solution of silver nitrate, the colloidal particles of silver iodide are associated with which of the following Helmholtz double layer ?

Answer»

`Ag:Ag^(+):I^(-)`
`AgI:K^(+):NO_(3)^(-)`
`AgI:NO_(3)^(-):Ag^(+)`
`AgI:I^(-):K^(+)`

Solution :As excess of KI has been added,` I^(-)` ions are adsorbed on AgI FORMING a fixed layer (and giving it a negative charge). It then atracts the counter ions `(K^(+))` from the medium forming a SECOND layer (DIFFUSED layer).`


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