Colloids Questions

The protecting power of lyophilic colloidal sol is expressed in terms of:

Which property of colloids is not dependent on the charge on colloidal particles?

Fog is a colloidal solution of:

The coagulation values in millimoles per litre of the electrolytes used for the coagulation of ${\text{As}}_2{\text{S}}_3$ are given below:I. $(\text{NaCl})=52$ II. $({\text{BaCl}}_2)=0.69$ III. $({\text{MgSO}}_4)=0.22$ The correct order of their coagulating power is: