Graphite electrodes are used to electrolyse aqueous copper(II) sulfate. Which row shows the product and the observations at each electrode during the electrolysis?
- Aanode: oxygen, bubbles of gas; cathode: copper, electrode turns pink
- Banode: copper, electrode turns pink; cathode: oxygen, bubbles of gas
- Canode: none, electrode dissolves; cathode: copper, electrode turns pink
- Danode: oxygen, bubbles of gas and electrode dissolves; cathode: hydrogen, bubbles of gas