Gold number is associated with: (A) Electrophoresis (B) Purple of cassius (C) Protective colloid (D) Amount of pure gold

Protective colloids

The minimum amount of protective colloid in mg which is just sufficient to prevent the coagulation of 10 ml of given gold solution when 1 ml of 10% solution of sodium chloride is added to it, is called the gold number.

Hence, the correct option is (C)

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