Paragraph: The most important property of hydrophobic colloidal...

Paragraph: The most important property of hydrophobic colloidal dispersions is that the particles carry electric charge. This charge is largely responsible for the stability of lyophobic solsParagraph: Consider the method of preparation of sols by adsorption of common ion. Which of these given sols carry positive charge?

Options

AAdding silver nitrate to a solution containing potassium iodide
BAddition of $\mathrm{FeCl}_3$ to excess of hot water
CAdding potassium iodide to a solution containing silver nitrate
DAddition of $\mathrm{FeCl}_3$ to NaOH solution

Correct answer

C. Adding potassium iodide to a solution containing silver nitrate

Step-by-step solution

(B)

\mathrm{Fe}_2 \mathrm{O}_3 \cdot \mathrm{xH}_2 \mathrm{O} / \mathrm{Fe}^{3+}

(C)

\mathrm{AgI} / \mathrm{Ag}^{+}

Common ion present in excess is adsorbed

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