Point out the false statement:

Which one of the following is not a surfactant?

$A$ 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:

Flocculation value of $BaCl_2$ is much less than that of $KCl$ for sol $A$ and flocculation value of $Na_2SO_4$ is much less than that of $NaBr$ for sol $B.$ The correct statement among the following is

Tyndall effect is shown by

The flocculation value of $HCl$ for arsenic sulphide sol is $30 \; mmol \; L^{-1}$. If $H_{2}SO_{4}$ is used for the flocculation of arsenic sulphide,the amount,in grams,of $H_{2}SO_{4}$ in $250 \; mL$ required for the above purpose is (molecular mass of $H_{2}SO_{4} = 98 \; g/mol$)