The movement of colloidal particles towards the oppositely charged electrodes on passing electricity is known as

$A$ milk-water mixture,when viewed by reflected light,appears in which colour?

On adding a few drops of dilute $HCl$ or $FeCl_3$ to freshly precipitated ferric hydroxide,a red-coloured colloidal solution is obtained. This phenomenon is called:

Statement $I:$ For colloidal particles,the values of colligative properties are of small order as compared to values shown by true solutions at the same concentration.
Statement $II:$ For colloidal particles,the potential difference between the fixed layer and the diffused layer of opposite charges is called the electrokinetic potential or zeta potential.
In the light of the above statements,choose the correct answer from the options given below.

Explain the cleansing action of soaps.

Why is gelatin used in the preparation of ice cream?