Gold number is associated with:

Options

A. The number of mg of lyophilic colloid which should be added to 10 ml of ferric hydroxide sol so as to prevent its coagulation by the addition of 1 ml of 10% sodium chloride solution
B. The number of mg of lyophilic colloid which should be added to 10 ml of standard red gold sol so as to just prevent its coagulation on addition of 1 ml of 10% NaCl
C. 1mg of gold sol to be added to a lyophilic colloid to coagulate it
D. 1mg of an electrolyte required to coagulate a gold sol

Answer

B