Smoke is a colloidal dispersion of :-

$100 \; mL$ of $5 \% \; (w/v)$ solution of $NaCl$ in water was prepared in a $250 \; mL$ beaker. Albumin from the egg was poured into the $NaCl$ solution and stirred well. This resulted in a/an:

Which of the following ions has the maximum coagulation power?

Match column $I$ (process) with column $II$ (application).

Column $I$	Column $II$
$A$. Dialysis	$a$. Cleansing action of soap
$B$. Peptization	$b$. Coagulation
$C$. Emulsification	$c$. Colloidal solution preparation
$D$. Electrophoresis	$d$. Purification of colloidal solution

For the coagulation of a positively charged hydrated ferric oxide sol,the flocculating power of the ions is in the order:

The rule that states that the greater the valency of the flocculating ion,the greater is its coagulating power,was proposed by whom?