The size of colloidal particles is:
- A$1 \ nm$ to $1000 \ nm$ (or $1 \ m\mu$ to $1000 \ m\mu$)
- B$10 \ \mu m$ to $20 \ \mu m$
- C$0.05 \ nm$ to $0.1 \ nm$
- D$25 \ \mu m$ to $30 \ \mu m$
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$100 \, cm^3$ of gold sol requires $10^{-4} \, g$ of gelatin to prevent coagulation when $1 \, cm^3$ of $10 \% \, NaCl$ solution is added. The gold number of gelatin is ............ .
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