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Question

(a) What type of isomerism is shown by the complex [Co(NH3)5(SCN)]2+?
(b) Why is [NiCl4]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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Solution

(a) Linkage isomerism.
(b) Because CN is stronger ligand than Cl.
(c) As the energy gap between eg and t2g in tetrahedral complexes is very low, electrons go to higher states to avoiding pairing.

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