The example of a heteropolar sol is

What is the range of the size of colloidal particles?

Which one of the following is used as an eye lotion?

Match List-$I$ and List-$II$.

List-$I$	List-$II$
$A$. Osmosis	$I$. Solvent molecules pass through semi permeable membrane towards solvent side.
$B$. Reverse osmosis	$II$. Movement of charged colloidal particles under the influence of applied electric potential towards oppositely charged electrodes.
$C$. Electro osmosis	$III$. Solvent molecules pass through semi permeable membrane towards solution side.
$D$. Electrophoresis	$IV$. Dispersion medium moves in an electric field.

Choose the correct answer from the options given below:

In which of the following will the particle size be greater than $300 \, m\mu$?

The coagulation values in millimoles per litre of the electrolytes used for the coagulation of $As_2S_3$ are given below:
$I$. $(NaCl) = 52,$
$II$. $(BaCl_2) = 0.69,$
$III$. $(MgSO_4) = 0.22$
The correct order of their coagulating power is: