The coagulation of 100 mL of a colloidal solution of gold is completely prevented by addition of 0.25 gm of a substance "X" to it before the addition of 1 mL of a 10% NaCl solution. The gold number of "X" is :

0.25

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2.5

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250

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Solution

The correct option is C 25
Gold number is defined as number of milligrams of protective colloid added to 10 mL of colloidal gold solution to prevent its coagulation on addition of 1 mL of 10% NaCl solution.
In this question, the protective colloid "X" is added to a 100 mL solution is 250 mg i.e. 25 mg per 10 mL. Therefore, the gold number of "X" will be 25.

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