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Introduction to Colloids

When in exces...

Question

When in excess, a very dilute aqueous solution of $K I$ 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 g I : A g^{+} : N O_{3}^{-}

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A g I : K^{+} : N O_{3}^{-}

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A g I : N O_{3}^{-} : A g^{+}

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A g I : I^{-} : K^{+}

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Solution

The correct option is B $A g I : I^{-} : K^{+}$
The Helmholtz double layer contains a layer of opposite charge on the surface of colloidal particles.

$A g N O_{s} + K I e x c e s s \to A g I + K N O_{3}$

$A g I + K I \to A g I : I^{-} : K^{+}$ .

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What do you observe when

(a) dilute sulphuric acid is added to granulated zinc ?

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