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Question

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?


A
AgI ⋮ Ag+ ⋮ I
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B
AgI ⋮ K+ NO3-
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C
AgI ⋮ NO3- ⋮ K+
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D
AgI ⋮ I ⋮ K+
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Solution

The correct option is D AgI ⋮ I ⋮ K+


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 attracts the counter ions K+ from the medium forming a second layer (diffused layer).


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