The purification of colloids is carried out by which of the following processes?

Which of the following electrolytes will have the maximum flocculation value for $Fe(OH)_3$ sol?

Which of the following nanomaterials has one dimension less than $100 \ nm$?

The coagulation of $100 \, mL$ of a colloidal sol of gold is completely prevented by the addition of $0.25 \, g$ of a substance '$X$' to it before adding $10 \, mL$ of $1 \% \ NaCl$ solution. The gold number of '$X$' is:

Which of the following is a lyophobic colloidal solution?

$A$ micelle formed during the cleansing action by soap is