Account for the fact that `[Fe(CN)_6]^(3-)` is weakly paramagnetic while `[Fe(CN)_6]^(2+)` is diamagnetic.

How will you account for the following : (i) [Fe(CN)_6]^(-) is weakly paramagnetic while [Ni(CN)_4]^(2+) diamagnetic. (ii) [Ni(CO)_4] possess tetrahedral geometry while [Ni(CN)_4]^(2-) is square planar.

[Cr(NH_3)_6]^(3+) is paramagnetic while [Ni(CN)_4]^(2-) is diamagnetic. Explain why?

[Fe(H_2O)_6]^(3+) is strongly paramagnetic whereas [Fe(CN)_6]^(3-) is weakly paramagnetic. Explain.

The questions given below consist of Assertion (A) and Reason (R ) . Use the following key to select the correct answer. [FeF_6]^(4-) is a paramagnetic complex while [Fe(CN)_6^(4-)] is a diamagnetic complex . Reason : [FeF_6]^(4-) is an outer orbital complex whereas [Fe(CN)_6]^(4-) is an inner orbital complex .