(B) Gold number is defined as the minimum amount of a lyophilic colloid in $mg$ that must be added to $10 \, mL$ of a standard gold sol to prevent its

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The number of $mg$ of lyophilic colloid which should be added to $10 \, mL$ of standard gold sol so as to prevent its coagulation by the addition of $1 \, mL$ of $10 \, \% \, NaCl$ solution.

(B) Gold number is defined as the minimum amount of a lyophilic colloid in $mg$ that must be added to $10 \, mL$ of a standard gold sol to prevent its coagulation when $1 \, mL$ of a $10 \, \% \, NaCl$ solution is added to it.It is a measure of the protective power of a lyophilic colloid.

Class 12 Chemistry Surface Chemistry Colloids, Emulsion, Gel and Their properties with application

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Gold number is defined as:

A
The number of $mg$ of lyophilic colloid which should be added to $10 \, mL$ of ferric hydroxide sol so as to prevent its coagulation by the addition of $1 \, mL$ of $10 \, \% \, NaCl$ solution.
B
The number of $mg$ of lyophilic colloid which should be added to $10 \, mL$ of standard gold sol so as to prevent its coagulation by the addition of $1 \, mL$ of $10 \, \% \, NaCl$ solution.
C
The $mg$ of gold salt to be added to a lyophilic colloid to coagulate it.
D
The $mg$ of an electrolyte required to coagulate a colloid.