Which of the following is lyophobic in nature?

How does the precipitation of colloidal smoke take place in a Cottrell precipitator?

Gold sol is not:

Which of the following anions has the lowest coagulating power for the precipitation of a positive sol?

Label the hydrophilic and hydrophobic parts in the following compounds.
$(i)$ $CH_3(CH_2)_{10}CH_2OSO_3^-Na^{+}$
$(ii)$ $CH_3(CH_2)_{15}N^{+}(CH_3)_3Br^{-}$
$(iii)$ $CH_3(CH_2)_{16}COO(CH_2CH_2O)_nCH_2CH_2OH$

At $CMC$,the surface active molecules .........