Pumice stone is an example of which type of colloidal system?

Purification of colloids is done by the process of

Which of the following pairs can be separated by dialysis?

An example of a micelle is ........

The surface tension of a lyophilic sol is ............

$100 \ mL$ of $0.0018\%(w/v)$ solution of $Cl^{-}$ ion was the minimum concentration of $Cl^{-}$ required to precipitate a negative sol in one $h$. The coagulating value of $Cl^{-}$ ion is $.......$ (Nearest integer).