Identify the incorrect statement.

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(C) $1$. Colloidal systems exhibit Brownian motion and Tyndall effect,which is a correct statement.$2$. Gold number is defined as the minimum amount o

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$A$ colloidal solution of liquid in liquid is called a gel.

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(C) $1$. Colloidal systems exhibit Brownian motion and Tyndall effect,which is a correct statement.$2$. Gold number is defined as the minimum amount of protective colloid in milligrams required to prevent the coagulation of $10 \ mL$ of a standard gold sol when $1 \ mL$ of $10\% \ NaCl$ solution is added. Thus,it is a measure of the protective power of lyophilic colloids,which is a correct statement.$3$. $A$ colloidal solution of liquid in liquid is called an emulsion,not a gel. $A$ gel is a colloidal system where a liquid is dispersed in a solid. Therefore,this statement is incorrect.$4$. Hardy-Schulze rules state that the greater the valence of the flocculating ion added,the greater is its power to cause precipitation (coagulation). This is a correct statement.

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