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The correct statement about iron include...

The correct statement about iron includes
(I) the oxidation state of iorn is `+6` in `K_(2)FeO_(4)`
(II) that the iron shows `+2` oxidation state with `6` electron in the 3d orbitals
(III) the common oxidation state of iron is `+3` with five unpaired electron in the 3d orbital

A

1,2 and 3

B

3 and 4 only

C

4 only

D

3only

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