Calculate the number of sols that are negatively charged. \( \begin{array}{ll}\mathrm{Fe}_{2} \m...

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Calculate the number of sols that are negatively charged.
\( \begin{array}{ll}\mathrm{Fe}_{2} \mathrm{O}_{3} \cdot \mathrm{xH}_{2} \mathrm{O} & \mathrm{Sb}_{2} \mathrm{~S}_{3} \text { sol } \\ \mathrm{Ag} \text { sol } & \mathrm{Cu} \mathrm{sol} \\ \mathrm{Blood} & \text { basic dye } \\ \text { sol of clay } & \text { sol of starch } \\ \text { sol of sodium stearate } & \text { sol of sodium lauryl- } \\ \text { sol of charcoal } & \text { sulphate }\end{array} \)
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