On addition of one $1 m L$ of solution of $10 %$ $N a C l$ to $10 m L$ of red gold sol in presence of $0.025 g$ of starch, the coagulation is just prevented. The gold number of starch.

0.025

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0.25

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2.5

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25

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Solution

The correct option is D $25$
The gold number according to Zsigmondy may be defined as the number of milligrams of the protective colloid which must be added to $10$ cc of a given gold sol so as to just prevent its precipitation by addition of $1$ cc of $10 %$ $N a C l$ solution.
Here, $0.025$ g means $25$ mg. Therefore, gold number is $25$ .

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