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

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.$${AgNO_{s} + \underset{excess}{KI}} \rightarrow AgI + KNO_{3}$$$$AgI + KI \rightarrow AgI : I^{-} : K^{+}$$.Chemistry

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