Blue colour of water in sea is due to

The shape of colloidal particles is

When $FeCl_3$ is added to an excess of hot water,it gives a sol '$X$'. When $FeCl_3$ is added to $NaOH_{(aq)}$ solution,it gives a sol '$Y$'. The sols '$X$' and '$Y$' formed in the above processes respectively are:

Which of the following is not a negatively charged sol?

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:

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

List-$I$	List-$II$
$A$. Negatively charged sol	$I$. $Fe_{2}O_{3} \cdot xH_{2}O$
$B$. Macromolecular colloid	$II$. $CdS$ sol
$C$. Positively charged sol	$III$. Starch
$D$. Cheese	$IV$. $A$ gel

Choose the correct answer from the options given below: