The correct statement about iron includes (I) the highest oxidation state of iron is \( +6 \) in...

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The correct statement about iron includes
(I) the highest oxidation state of iron is \( +6 \) in \( \mathrm{K}_{2} \mathrm{FeO}_{4} \)
\( P \)
(II) that the iron shows \( +2 \) oxidation state with six electrons in the \( 3 d \) orbitals
(III) the common oxidation state of iron is \( +3 \) with five unpaired electrons in the \( 3 d \) orbital
W
(a) I, II, III
(b) I, II
(c) II, III
(d) I only
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