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In which of the following does the central atom exhibit an oxidation state of +2 ? (A) K2 [Ni(CN)4 ] (B) K3 [Fe(CN)6 ] (C) [Fe(C2O4)3 ]^3 –

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In which of the following does the central atom exhibit an oxidation state of +2 ? 

(A) K2 [Ni(CN)4 ] 

(B) K3 [Fe(CN)6 ] 

(C) [Fe(C2O4)3 ]3 – 

(D) [Cu(NH3)4 ]2+

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(A) K2 [Ni(CN)4 ]

(D) [Cu(NH3)4 ]2+ 

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