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On addition of one mL of solution of 10% $NaCl$ to 10 mL of red gold sol in presence of 0.025 g of starch, the coagulation is just prevented. The gold number of starch is : ·
[Fill OMR sheet with the value obtained by dividing actual answer by 5.]

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answer is 5.

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Detailed Solution

Gold number 25 because 25 mg of starch prevents coagulation of 10 ml red gold sol.

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