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In which of the following octahedral com...

In which of the following octahedral complexes of Co. (At . No. 27) , will the magnitude of `Delta_0` be the highest ?

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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The correct Answer is:
D
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