Which of the following is a lyophobic colloidal solution?

The qualitative sketches $I$,$II$,and $III$ given below show the variation of surface tension with molar concentration of three different aqueous solutions of $KCl$,$CH_3OH$,and $CH_3(CH_2)_{11}OSO_3^{-}Na^{+}$ at room temperature. The correct assignment of the sketches is

Which of the following surfactants will form micelles in an aqueous solution at the lowest molar concentration under specific conditions?

The precipitation power of an electrolyte increases with:

How does it become possible to cause artificial rain by spraying $AgI$ on the clouds?

The process of separating colloidal particles from crystalloid impurities using a semipermeable membrane is known as: