In which of the following , the central ...

In which of the following , the central atom does NOT exhibit an oxidation state of `+2` ?

A

`K_2[Ni(CN)_4]`

B

`K_4[Fe(CN)_6]`

C

`[Fe(C_2O_4)_(3)]^(3-)`

D

`[Cu(NH_3)_4]^(2+)`

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The correct Answer is:

C

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