The blue color of the sky is due to $.....$.

Match the following:-

List-$I$	List-$II$
$A$. Dialysis	$IV$. Purification of colloidal mixture
$B$. Peptization	$I$. Precipitate converts to colloidal mixture
$C$. Flocculation	$II$. Precipitation of colloidal mixture
$D$. Gold number	$III$. Protective power

Albumin has a gold number of $0.09$. What is the minimum amount of albumin (in $mg$) required to protect the coagulation of $40 \ mL$ of gold sol from $4 \ mL$ of $10 \% \ NaCl$ solution?

Into how many parts are colloidal sols divided according to the nature of interaction between the dispersed phase and the dispersion medium?

If some gelatin is mixed in a colloidal solution of gold,then it does:

Gold number is associated with