(A) The protective action of different lyophilic colloids is expressed in terms of Gold number. It is defined as the minimum mass of a protective coll

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(A) The protective action of different lyophilic colloids is expressed in terms of Gold number. It is defined as the minimum mass of a protective colloid in milligrams that prevents the coagulation of $10 \ mL$ of a gold sol when $1 \ mL$ of $10\%$ $NaCl$ solution is added to it.