Explain : `[Co(CN)_6]^(3-)` is diamagnetic while `[CoF_6]^(3-)` is paramagnetic.

Consider the following two complex ions: [CoF_6]^(3-) and [Co(C_2O_4)_3]^(3-) . Which of the following statement(s) is/are false? I. Both are octahedral. II. [Co(C_2O_4)_3]^(3-) is diamagnetic while [CoF_6]^(3-) is paramagnetic. III. Both are outer orbital complexes. IV. Inboth the complexes the central metal is in the same oxidation state.

Explain: [Ni (CN)_4]^(2-) is diamagnetic while [Ni(Cl)_4]^(2-) is paramagnetic.

Explain [Fe(H_2O)_6]^(3+) is paramagnetic.

Explain, Why [Ni(CO)_4] is diamagnetic whereas [NiCl_4]^(2-) is paramagnetic ?

Explain why Cu(I) is diamagnetic while Cu(II) is paramagnetic.

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

Explain that [Co(NH_3)_6]^(3+) is a low spin complex while [CoF_6]^(3-) is a high spin complex.

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