Question

# In which of the following compounds transition metal is in oxidation state zero

A
[Co(NH3)6]Cl2
B
[Fe(H2O)6SO4]
C
[Ni(CO)4]
D
[Fe(H2O)3](OH)2

Solution

## The correct option is C $$\left[ \mathrm { Ni } ( \mathrm { CO } ) _ { 4 } \right]$$Nickel shows zero oxidation state in carbonyl complex as $$CO$$ ligand has $$0$$ charge and complex as a whole also has $$0$$ charge. So, central metal atom has $$0$$ charge.Chemistry

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