(a) What type of isomerism is shown by the complex `[Co(NH_(3))_(5)(SCN)]^(2+)`?
(b) why is `[NiCl_(4)]^(2-)` paramagnetic while `[Ni(CN)_(4)]^(2-)` is diamagnetic ? (Atomic number of Ni=28)
(c) Why are low spin tetrahedral complexes rarely observed?