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In which of the following complexes, the...

In which of the following complexes, the metal ion is in zero oxidation state ?

A

`Mn(CO)_4`

B

`Zn_2 [Fe(CN)_6]`

C

`[Cu(NH_3)_4]Cl_2`

D

`[Ag(NH_3)_2]Cl`

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The correct Answer is:
A
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