On addition of one ml solution of 10% to 10 ml red gold sol in the presence of 0.0025 g of starch, the coagulation is just prevented. The gold number of starch is

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Question

On addition of one ml solution of 10% $NaCl$ to 10 ml red gold sol in the presence of 0.0025 g of starch, the coagulation is just prevented. The gold number of starch is

Prashant Kotian · Accepted Answer

Correct answer: B. 0.0025 g of starch = 2.5 mg. Since this amount prevents coagulation of 10 mL gold sol by 1 mL of 10% , the gold number of starch is 2.5.

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