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Question

The coagulation of 200 ml of a colloidal solution of gold is completely prevented by adding 0.50 g of starch to it before adding 1 ml of 10% NaCl solution. Calculate the gold number of starch

A
2.5
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B
25
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C
0.25
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D
250
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Solution

The correct option is B 25
Gold number is the amount of protective colloid in mg that prevents coagulation of 10 ml gold sol on addition of 1 ml of 10% NaCl solution.
Gold number is;
As 200 ml requires 500 mg of starch
10 ml will require,
500×10200=25

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