On addition of $1 \ mL$ of $10 \%$ $NaCl$ to $10 \ mL$ gold sol in the presence of $0.038 \ g$ of starch the coagulation is just prevented. Then the value of gold number of starch is

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

The trend in the coagulating power for the same concentration of $BaCl_2$, $MgCl_2$, and $NaCl$, respectively, is

The purple of Cassius is due to the presence of $......$.

Dialysis is the process of separation of

$A$ colloidal solution is subjected to an electric field,and the colloidal particles move towards the anode. The amount of electrolytes $BaCl_{2}$,$AlCl_{3}$,and $NaCl$ required to coagulate the given colloid is in the order: