An aqueous solution of copper(II) sulfate, CuSO4(aq)\text{CuSO}_4(aq)CuSO4(aq), is electrolysed using inert carbon electrodes.
Which row correctly identifies the substance produced at the positive electrode (anode) and the negative electrode (cathode)?
Anode: Cu(s)\text{Cu}(s)Cu(s); Cathode: O2(g)\text{O}_2(g)O2(g)
Anode: O2(g)\text{O}_2(g)O2(g); Cathode: H2(g)\text{H}_2(g)H2(g)
Anode: O2(g)\text{O}_2(g)O2(g); Cathode: Cu(s)\text{Cu}(s)Cu(s)
Anode: SO2(g)\text{SO}_2(g)SO2(g); Cathode: Cu(s)\text{Cu}(s)Cu(s)