Surface Chemistry

\(\text { Match the following. }\)

$$ \begin{array}{llll} \hline & \text { List I } & & \text { List II } \\ \hline \text { A. } & \text { Negatively charged sol } & \text { I. } & \text { Emulsion } \\ \hline \text { B. } & \text { Milk } & \text { II. } & \text { Kala azar } \\ \hline \text { C. } & \text { Gold number } & \text { III. } & \begin{array}{l} \text { FeCl} \mathbf{C}_3 \text { solution is added to } \\ \text { excess NaOH solution } \end{array} \\ \hline \text { D. } & \text { Colloidal antimony } & \text { IV. } & \text { Protection of colloids } \\ \hline \end{array} $$

The correct answer is