The complex ion having minimum magnitude of △0 (CFSE) in octahedral field is:
A
[CoCl6]3−
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B
[Co(CN)6]3−
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C
[Co(H2O)6]3+
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D
[Co(NH3)6]3+
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Solution
The correct option is A[Co(CN)6]3− The complex ion having the maximum magnitude of Δo (CFSE) in octahedral field depends on position of ligand in spectrochemical series. Among the given ligands coordinated to metal ion CN− is higher in the series and hence [Co(CN)6]3− will show maximum Δo (CFSE) value.