(A) Gold sols are formed by the aggregation of a large number of gold atoms,making them $multimolecular$ colloids. They are $lyophobic$ in nature and

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(A) Gold sols are formed by the aggregation of a large number of gold atoms,making them $multimolecular$ colloids. They are $lyophobic$ in nature and carry a $negative$ charge due to the adsorption of $OH^-$ ions. They are not $macromolecular$ colloids,as macromolecular colloids consist of large molecules like proteins or starch.