A) \[[\operatorname{F}e{{({{\operatorname{CN}}_{6}})}^{3-}}\]
B) \[{{[\operatorname{Co}(\operatorname{O}\operatorname{X})]}^{3-}}\]
C) \[{{[\operatorname{Fe}{{\operatorname{F}}_{6}}]}^{3-}}\]
D) \[{{[\operatorname{Co}{{\operatorname{F}}_{6}}]}^{3-}}\]
Correct Answer: B
Solution :
\[{{[Fe{{(CN)}_{6}}]}^{3-}}\]has magnetic moment of a single unpaired electron whereas \[{{[Fe{{F}_{6}}]}^{3-}}\] has a magnetic moment of five unpaired electrons. \[{{[Co{{F}_{6}}]}^{3-}}\]is paramagnetic with four unpaired electrons while \[{{[Co{{({{C}_{2}}{{O}_{4}})}_{3}}]}^{3}}\] is diamagnetic. This anomaly is explained by valence bond theory in terms of formation of inner and outer orbital coordination entities. \[{{[Co{{({{C}_{2}}{{O}_{4}})}_{3}}]}^{3-}}\]is an inner orbital complexes having \[{{d}^{2}}s{{p}^{3}}\]hybridization.
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