on addition of 1 ml solution of `10% NaCl` to 10 ml gold sol in the presence of 0.25g of strach, the coagulation is just prevent

on addition of 1 ml solution of `10% NaCl` to 10 ml gold sol in the presence of 0.25g of strach, the coagulation is just prevented. Strach has the following gold number
A. `0.025`
B. `0.25`
C. `2.5`
D. 25

on addition of 1 ml solution of `10% NaCl` to 10 ml gold sol in the presence of 0.25g of strach, the coagulation is just prevented. Strach has the fol

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