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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. Co = 27)

A

`[Co(NH_3)_6]^(3+)`

B

`[Co(CN)_6]^(3-)`

C

`[Co(C_2O_4)_3]^(3-)`

D

`[Co(H_2O)_6]^(3+)`

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