What is the coagulating power of an effective ion carrying a charge opposite to that of the sol particles called?

During electrosmosis of $Fe(OH)_3$ sol,

How are the colloidal solutions classified on the basis of physical states of the dispersed phase and dispersion medium?

The colloidal solution of gelatin is known as:

Which of the following is not a negatively charged sol?

Identify the option having the correct set of True $(T)$ or False $(F)$ statements with respect to colloidal solutions:
$(I)$ Lyophobic colloids are heavily solvated by the dispersion medium.
$(II)$ Multimolecular colloids are usually lyophilic.
$(III)$ Surface tension of a starch aqua sol will be lesser than that of water.
$(IV)$ Blood gets coagulated by the addition of $NaCl$.