What is the chemical nature of q-sepharose that allows it to be used as an ion exchanger?

The chemical nature of Q sepharose which allows it to be used as an ion exchanger include the following: It is an insoluble matrix which is in form of micro beads. The bead are porous, which provides a large surface area within and outside them. This properties make it possible for Q sepharose to finely separate different organic molecules.

Cr(oh)3 -> cr(3+) + 3oh-