Which statement is incorrect? (A) `Ni(CO)_4` - Tetrahedral,paramagnetic (B) `[Ni(CN)_(4)]^(2-)` square planar,diamagnetic (C) `[Ni(NH_(3))_(6)]^(2+)` Octahedral,paramagnetic (D) `[NiCl_(4)]^(2)` Tetrahedral,paramagnetic

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

Explain the following giving reasons (a) [NiCI_(4)]^(2-) is tetrahedral and paramagnetic whereas [Ni(CN)_(4)]^(2-) is square plannar and dimagnetic (b) [Fe(H_(2)O)_(6)]^(3+) ion is more paramagnetic than [Fe(CN)_(6)]^(3-) ion (c ) Ni(CO)_(4) is tetrahedral while [Ni(CN)_(4)]^(2-) ion is square planar (d) [Co(F_(6))]^(3-) is a high spin complex whereas [Co(CN)_(6)]^(3-) ion is a low spin complex .

The correct order of matching of complex compound in column I with the properties in column II: {:(,"Column I",,"Column II",),((A),[Cr(NH_(3))_(6)]^(3+),(P),"Tetrahedral and paaramagnetic",),((B),[Co(CN)_(6)]^(3-),(Q),"Octahedral and diamagnetic",),((C ),[Ni(CN)_(4)]^(2-),(R ),"Octahedral and paramagnetic",),((D),[Ni(Cl)_(4)]^(2-),(S),"Square planar and diamagnetic",):}

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