Oxidation number is the charge assigned...

Oxidation number is the charge assigned to an atom of a molecule or ion according to some arbitry rules .In neutral molecules , the sum of the oxidation numbers of all the atoms present is zero while in a simple or complex ion it is equal to the net charge on ion. In some cases the oxidation number may be even fractional. Athough sometimes a particular elemenet may have same valency and oxidation state but these are based upon different concepts.The number of oxidation states available for a particular elements are normally more than the valencies
A brown complex has the formula:
`[Fe(H_(2))(O)_(5)NO]SO_(4)` the oxidation number of iron is:

`+1`

`+2`

`+3`

Verified by Experts

The correct Answer is:

`[Fe(H_(2)O)_(5)NO]SO_(4)`
`x+0+1=+2`
`x=2-1=+1`

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The oxidation number of metal atom is zero in

`[Ni(CO)_(4)]`

`[Fe_(2)(CO)_(5)]`

`Na[Co(CO)_(4)]`

`-3`

`-1`

`-4`

`-2`

`+2`

`+3`

`+4`

`+6`