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In which of the following coordination e...

In which of the following coordination entities the magnitude of `Delta_(0)` (CFSE in octahedral field) will be maximum?
(At. no. of Co= 27)

A

`[Co(C_(2)O_(4))_(3)]^(3-)`

B

`[Co(H_(2)O)_(6)]^(3+)`

C

`[Co(NH_(3))_(6)]^(3+)`

D

`[Co(CN)_(6)]^(3-)`

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