Fex2 and Fey3 are known when x and y are ______.

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KollegeApply · Accepted Answer

Fex2 and Fey3 are known when x and y are x = F, Cl, Br, I and y = F, Cl, Br. Explanation: Iron forms Fex2 (ferrous halides) with all halogens (F, Cl, Br, I), and Fex3 (ferric halides) only with F, Cl, and Br. This is because iodine is too weak an oxidising agent to oxidise Fe(II) to Fe(III), so FeI3 is not stable.

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