Explain why `[NiCI_4]^(2-)` ion is paramagnetic but `[Ni(CN)_4]^(2-)` is dia-magnetic.

Write IUPAC name of the complex [Cr(NH_(3))_(4)Cl_(2)]Cl. What type of isomerism is exhibited by the complex [Co(en)_(3)]^(3+) (en = ethane - 1, 2 - diamine) ? Why is [NiCl_(4)]^(2-) paramagnetic but [Ni(CO)_(4)] is diamagnetic ? (Atomic no : Cr = 24, Co = 27, Ni = 28)

KO_2 is paramagnetic but Li_2O is diamagnetic-Why ?

Why is [NiCl_(4)]^(2-) paramagnetic while [Ni(CN_(4))]^(2-) is diamagnetic ? (At. No. of Ni = 28)

The geometry of [Ni(CN)_4]^(2-) is

O_2 is paramagnetic, why?

[Cr(NH_(3))_(6)]^(3+) is paramagnetic while [Ni(CN)_(4)]^(2-) is diamagnetic. Explain why?

B_(2) is paramagnetic but C_(2) is not. Explain.

[NiCl_(4)]^(2-) is paramagnetic while [Ni(CO)_(4)] is diamagnetic though both are tetrahedral. Why?

Explain why N_(2)O_(4) is diamagnetic .

Explain why Cu(NH_(3))_4]^(2+) ion is coloured but [Cu(CN)_4]^(3-) ion is colourless.