Question

The crystal field stabilization energy (CFSE) is the highest for
A. `[CoF_(4)]^(2-)`
B. `[Co(NCS)_(4)]^(2-)`
C. `[Co(NH_(3))_(6)]^(3+)`
D. `[CoCl_(4)]^(2-)`

Answer 1

Correct Answer - C
Higher the oxidation state of the metal, greater the crystal field splitting energy . In options (a), (b) and (d), Co is present in `+2` oxidation state and in (c ) it is present in `+3` oxidation state and hence has a higher value of CFSE.