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  • Which formula/name pair is incorrect? A) FeSO4 iron(II) sulfate B) Fe2 (SO3)3 iron(III) sulfite C) FeS iron(II) sulfide D) FeSO3 iron(II) sulfite E) Fe2 (SO4)3 iron(III) sulfide

Question

Which formula/name pair is incorrect? A) FeSO4 iron(II) sulfate B) Fe2 (SO3)3 iron(III) sulfite C)…

Which formula/name pair is incorrect? A) FeSO4 iron(II) sulfate B) Fe2 (SO3)3 iron(III) sulfite C) FeS iron(II) sulfide D) FeSO3 iron(II) sulfite E) Fe2 (SO4)3 iron(III) sulfide

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Answer

The correct answer is E.

Explanation

  • Fe2(SO4)3 contains sulfate ions $SO_4^{2-}$. Three sulfates give $3\times(-2)=-6$, so two iron atoms must provide $+6$ total, i.e. $Fe^{3+}$. Therefore Fe2(SO4)3 is iron(III) sulfate, not iron(III) sulfide.
  • Iron(III) sulfide (with $S^{2-}$) would have formula Fe2S3.
  • The other pairs are correct: FeSO4 = iron(II) sulfate, Fe2(SO3)3 = iron(III) sulfite, FeS = iron(II) sulfide, FeSO3 = iron(II) sulfite.