“…210 With a number of complexing ions, both ruthenium(1v) and ruthenium(II1) form the same coloured complex, the quadrivalent ruthenium being reduced in each case by the ligand before complexing occurs; i.e., with A new series of a nitrosopentamminoruthenium(I1I) ion [Ru(NH,),*NO]+~ has been prepared : the salts are diamagnetic. 213 A number of salts of tetracyanopalladic(11) acid have been studied : 214 the acid, which is prepared by acidification of a solution of palladium(11) cyanide in excess of cyanide ions, forms insoluble salts with silver and copper(I1) ions or with their ammines. It also forms normal salts with benzidine, naphthaquinoline, and oxine, and the salts of nitron.…”