Substances whose solutions can easily pass through animal membranes are called $......$.

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 $NaCl$.

Alum is a water purifier because it

When soap is added to an oily part of cloth,the hydrocarbon part of soap dissolves in

The surface tension of a lyophilic sol is ......

Which of the following ions exhibits the maximum power of coagulation for a positively charged sol?