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

Surface Chemistry

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 its gold number.
Gold number of present colloid =25