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The coagulation of 100ml of colloidal solution of gold is completely prevented by addition of 0.25g of substance “X” to it before addition of 1ml of 10% NaCl solution. The gold number of “x” is

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answer is 25.

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Detailed Solution

Number of milligrams of protective colloid added in 10ml of colloidal gold to prevent its coagulation on addition of 1ml of 10% NaCl solution is called gold number
0.25g $\to$ 100ml
? $\to$ 10ml
= 0.025g
Gold number = 25

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