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Question

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

A
AgI:Ag+:NO3
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B
AgI:K+:NO3
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C
AgI:NO3:Ag+
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D
AgI:I:K+
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Solution

The correct option is B AgI:I:K+
The Helmholtz double layer contains a layer of opposite charge on the surface of colloidal particles.

AgNOs+KIexcessAgI+KNO3

AgI+KIAgI:I:K+.

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