Which of the following will show Tyndall effect?

Given below are two statements:
Statement $I:$ In the coagulation of a negative sol,the flocculating power of the three given ions is in the order - $Al^{3+} > Ba^{2+} > Na^{+}$
Statement $II:$ In the coagulation of a positive sol,the flocculating power of the three given salts is in the order - $NaCl > Na_{2}SO_{4} > Na_{3}PO_{4}$
In the light of the above statements,choose the most appropriate answer from the options given below:

An emulsifier is added to an emulsion to:

What is the name given to the process where particles settle down on the floor of a chamber?

Identify the dispersed phase and dispersion medium in fog,respectively.

According to the Hardy-Schulze rule,the flocculating power of an ion increases with: