A) \[{{K}_{4}}[Fe{{(CN)}_{6}}]\]
B) \[{{K}_{3}}[Fe{{(CN)}_{6}}]\]
C) \[[Ni{{(CO)}_{4}}]\]
D) \[[Pt{{(N{{H}_{3}})}_{4}}]C{{l}_{2}}\]
Correct Answer: C
Solution :
CO is a neutral ligand, so the oxidation state of metal in metal carbonyls is always zero. \[[Ni{{(CO)}_{4}}]\] \[x+(0\times 4)=0\] \[x=0\]
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