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

0.25

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250

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2.5

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Solution

The correct option is B 25

250 mg of X prevents coagulation of 100 ml of colloidal sol of gold. By definition, gold no. of X is that amount of it in mg which prevents coagulation of 10 ml of colloidal gold sol. Hence, to prevent coagulation of 10 ml of gold sol, the amount of X required = 25 mg, which is the gold number of X.

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100 m L

of a colloidal solution of gold is completely prevented by adding

0.25 g

of starch to it before adding

10 m L

10

N a C l

solution. Find out the gold number of starch.

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