Gold number is associated with

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Electrophoresis

Purple of cassius

Protective colloid

Amount of pure gold

answer is C.

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Detailed Solution

The gold number is a minimal weight in milligrammes required to avoid the coagulation of 10 ml of standard gold sol, the colour of which changes from red to blue upon coagulation.
Now, the first option is electrophoresis, which is a kinetic process that separates charged particles, particularly in protein molecules.
The second is cassius purple, which is a purple pigment made by reacting gold salts with tin (II) chloride and used for gold testing.
When it comes to the third alternative, the protective colloid is known as lyophilic colloid. Electrolytes are added to the lyophobic soil to prevent precipitation. The gold number represents the lyophilic colloids protecting ability.
The amount of pure gold, i.e. 24 carat gold, is the fourth option.
Hence, we can conclude that the gold number is linked to the protective colloid.

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