Medium
The coagulation of $10 \, mL$ of gold sol is prevented by the addition of $0.025 \, g$ of starch to it before adding $1 \, mL$ of $10 \% \, NaCl$ solution. The gold number of starch is .............
- A$0.025$
- B$0.25$
- C$2.5$
- D$25$
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