Question

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

Options

• x = F, Cl, Br, I and y = F, Cl, Br

• x = F, Cl, Br and y = F, Cl, Br, I

• x = Cl, Br, I and y = F, Cl, Br, I

• x = F, Cl, Br, I and y = F, Cl, Br, I

Answer 1

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.