The coagulation of 10 cm^(3) of Gold sol is completely prevented by addition of 0.025 g of starch to it. The gold number of starch is

The coagulation of 10 cm^(3) of Gold sol is completely prevented by ad

1.	The coagulation of 10 cm^(3) of Gold sol is completely prevented by addition of 0.025 g of starch to it. The gold number of starch is
Answer» 0.025 0.25 2.5 25 Solution :Gold NUMBER is the WEIGHT of protective COLLOID in MILLIGRAMS which prevents the coagulation of 10 `CM^(3)` of gold sol. `therefore` Gold number of starch `=0.25xx1000=25 (mg)`