Question

The coagulation of 100ml of colloidal solution of gold is completely prevented by addition of `0.25 g` of a substance "X" to it before addition of 1 ml of `10%` NaCI solution. The gold number of "X"is :
A. 0.25
B. 25
C. 250
D. 2.5

Answer 1

Correct Answer - B
number of milligrams of protective colloid added in 10 ml of alcohol gold to prevent its coagulation on addition of 1 ml of `10%` NaCl solution is called its gold number