The nature of charge on resulting colloidal particles when $FeCl_3$ is added to excess of hot water is:

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:

From the following,which are colloids?
$(i)$ $NaCl(aq.)$
$(ii)$ Fog
$(iii)$ Paint
$(iv)$ Aerosols
$(v)$ Mud
$(vi)$ Blood

Fog is an example of ...

What type of solutions are formed on dissolving different concentrations of soap in water?

Using very little soap while washing clothes does not serve the purpose of cleaning clothes because ..... .