Which of the following is not a property of a sol?

Choose the incorrect statement from the following:

The critical micelle concentration $(CMC)$ of soap in water is $10^{-3} \ mol \ L^{-1}$. What will a $10^{-4} \ mol \ L^{-1}$ solution of this soap in water be?

The gold number is maximum for which of the following lyophilic sols?

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

Which of the following methods is used for sol destruction?