The minimum concentration of an electrolyte required to cause coagulation of a sol is known as ..........

Which colloidal sol can be prepared by the chemical oxidation method?

Select the incorrect statement.

Match List-$I$ with List-$II$ and select the correct option:

List-$I$	List-$II$
$I$. Colloidal antimony	$A$. Kala-azar
$II$. Silver sol	$B$. Intramuscular injection
$III$. Milk of magnesia	$C$. Eye lotion
$IV$. Gold sol	$D$. Stomach disorder

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 $H_{2}SO_{4} = 98 \; g/mol$)

The function of gum-arabic in the preparation of Indian ink is: