Muddy water can be purified through coagulation using

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.

Fog is a colloidal solution of

The stability of a lyophobic colloid is due to

In shaving cream,the dispersion medium is

Which type of sol is argyrol? What are the uses of argyrol?