Which of the following is a lyophilic colloid?

Explain the purification of colloidal solutions.

At the critical micelle concentration $(CMC)$,..........

$100 \, cm^3$ of gold sol requires $10^{-4} \, g$ of gelatin to prevent coagulation when $1 \, cm^3$ of $10 \% \, NaCl$ solution is added. The gold number of gelatin is ............ .

The precipitation power of an electrolyte increases with:

Which statement is correct regarding a gel?