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(a) What type of isomerism is shown by t...

(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?

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(a) Linkage isomerism, (c ) They involve `sp^(3)` hybridisation. The 3d orbitals do not participate in hybridisation.
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