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  4. Gold number is an index for:

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Q. Gold number is an index for:

J & K CETJ & K CET 2000

Solution:

The minimum amount of the protective colloid in milligrams required to just prevent the coagulation of a $10\, mL$ of a given gold sol when $1\, mL$ of a $10 \%$ solution of sodium chloride is added to it, is known as gold number. Smaller the value of gold number, greater will be protecting power of the protective colloid.