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The correct statement about iron includes
(I) the highest oxidation state of iron is +6 in K₂FeO₄
(II) that the iron shows +2 oxidation state with six electrons in the 3d orbitals
(III) the common oxidation state of iron is +3 with five unpaired electrons in the 3d orbital

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An Intiative by Sri Chaitanya

I, Il, III

II, III

I only

I, II

answer is A.

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Detailed Solution

$\begin{aligned} {Fe}^{2 +} ⟶ [Ar]^{18} 3 d^{6} \\ {Fe}^{3 +} ⟶ [Ar]^{18} 3 d^{5} \end{aligned}$

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