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Which of the following compex ions has n...

Which of the following compex ions has no 'd' electron (s) in the central metal atom?

A

`[Cr(H_2O)_3]^(3+)`

B

`[Co(NH_3)_5CI]^(2+)`

C

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

D

`[MnO_4^-]`

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