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Question

In which of the following compounds, transition metal may have zero oxidation state ?

A
[Fe(CO)5]
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B
[Ni(CN)4]2
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C
Fe2O3
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D
CrO5
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Solution

The correct option is B [Fe(CO)5]
Option (A) is correct.
(A): [Fe(CO)5] have zero oxidation state
x+0×5=0
x=0
(B): [Ni(CN)4]2 have +2 oxidation state
x+(1×4)=(2)
=+2
(C): Fe2O3 have +3 oxidation state
2x+(2×3)=0
=+3
(D): CrO5 have +6 oxidation state


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