in which of the following transition metal complexes does the metal exhibits zero oxidation state.
A. `[Co(NH_(3))_(6)]Cl_(3)`
B. `[Fe(H_(2)O)_(6)]SO_(4)`
C. `[Ni(CO)_(4)]`
D. `[Fe(H_(2)O)_(6)]Cl_(3)`

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1 Answers

Correct Answer - 3
In metal carbonyl compounds the oxidation number of metal is zero because CO is neutral.

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