µ=√n(n+2) B.M. =3.83 B.M. n=3(n= No. of unpaired e−) Therefore, oxidation number of Cr should be +3 . Hence complex is Cr(H2O)6Cl3 Complex shows geometrical isomerism therefore formula of complex is[Cr(H2O)4Cl2]Cl.2H2O IUPAC Name: Tetraaquadichlorido chromium(III) Chloride dihydrate