Why does bleeding stop by rubbing moist alum?

Fog is a dispersion of

In Bredig's arc method,some alkali is added because:

Given below are two statements:
Statement $I :$ Emulsions of oil in water are unstable and sometimes they separate into two layers on standing.
Statement $II :$ For stabilisation of an emulsion,excess of electrolyte is added.
In the light of the above statements,choose the most appropriate answer from the options given below:

Among the colloids cheese $(C)$,milk $(M)$ and smoke $(S)$,the correct combination of the dispersed phase and dispersion medium,respectively is

At the critical micelle concentration,the surfactant molecules