Question

Complex ion which is most paramagnetic is (1){\lbrack Co(H2O)6\rbrack}^{3+} (2){\lbrack Co(C2O4)3\rbrack}^{3-} (3){\lbrack FeF6\rbrack}^{4-} (4){\lbrack Fe(H2O)5(NO)\rbrack}^2

Answer 1