Which of the following is not a colloid?

Match List-$I$ with List-$II$.

List-$I$ (Colloid Preparation Method)	List-$II$ (Chemical Reaction)
$(a)$ Hydrolysis	$(i) \; 2 AuCl_{3} + 3 HCHO + 3 H_{2}O \rightarrow 2 Au(sol) + 3 HCOOH + 6 HCl$
$(b)$ Reduction	$(ii) \; As_{2}O_{3} + 3 H_{2}S \rightarrow As_{2}S_{3}(sol) + 3 H_{2}O$
$(c)$ Oxidation	$(iii) \; SO_{2} + 2 H_{2}S \rightarrow 3 S(sol) + 2 H_{2}O$
$(d)$ Double Decomposition	$(iv) \; FeCl_{3} + 3 H_{2}O \rightarrow Fe(OH)_{3}(sol) + 3 HCl$

Choose the most appropriate answer from the options given below.

The coagulating power of effective ions having charge opposite to that of colloidal particles is given by ...

Which experimental method and instrument are used to measure the colloidal properties of a polymer solution?

The most effective coagulating agent for antimony sulphide sol is

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