The polarographic study of nickel (IO perchlorate hexahydrate in the presence of 2,2'-bipyridyl gave an evidence for oxidation of nickel (10 to nickel (110 while in the case of cop­per (II) nitrate study with 2,2'·bipyridyl as a ligand, gave an oxidation wave around 2V which correll­ponds to the oxidation of nitrate and the ligand rather than copper (IO.


M A A USMANI ,D B SCAIFE ,