1.

The protective power of the lyophilic colloids is expressed in terms of gold number a term introduced by Zsigmondy Gold number is the number of milligram of the protective colloid which prevent the coagulation of 10 ml of red gold sol, when 1 ml of a 10 percent solution of sodium chloride is added to it. Thus, smaller the gold number of lyophilic colloid, the greater is the protective power. Gold number gives an indication of

Answer»

protective NATURE of colloids
purity of gold in suspension
the charge on a COLLOIDAL solution of gold
g-mole of gold PER litre

Answer :A


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