NiCl4 2- is paramagnetic while NiCO4 is diamagnetic though both are tetrahedral why

[NiCl_4]^(2-) is paramagnetic while [Ni(CO)_4] is diamagnetic through both are tetrahedral. Why?

[NiCl_4]^(2-) is paramagnetic while [Ni(CO)_4] is diamagnetic through both are tetrahedral. Why?

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.

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

Why NF_3 is pyramidal while BF_3 is triangular planar though both are tetra atomic?

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

Explain why Cu(I) is diamagnetic while Cu(II) is paramagnetic in nature?

NO (Nitric oxide) is paramagnetic in the gaseous slate but diamagnetic in the liquid and solid states. Why ?