which characteristic is true in respect of colloidal particle?

Which of the following characteristics is TRUE with respect to colloids?

Compare the characteristics of a true solution , suspension and colloid with regard to the following : stabiliyt , visibility , appearance , sedimentation , Brownian motion and Tyndall effect .

Isoelectric point is the pH at which colloidal particles

Isoelectric point is the pH at which colloidal particles

Which of the following indicates the charge on colloidal particles?