A) \[{{[Co{{(N{{H}_{3}})}^{6}}]}^{2+}}\] is oxidized to diamagnetic \[{{[Co{{(N{{H}_{3}})}^{6}}]}^{3+}}\] by the oxygen in air.
B) \[{{[Fe{{(CN)}_{6}}]}^{3-}}\] is stable but \[{{[Fe{{F}_{6}}]}^{3-}}\] is unstable.
C) \[{{[NiC{{l}_{4}}]}^{2-}}\] is unstable with respect to \[{{[NiB{{r}_{4}}]}^{2-}}\].
D) None of these
Correct Answer: A
Solution :
With the promotion of one 3d electron to 5s or 4d, it becomes loosely bonded to the nucleus and hence, it may easily be removed and so Co(II) will easily be oxidised into Co(III).
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