$Fe x_2$ and $Fe y_3$ are known when $x$ and $y$ are :
- A$x = F, Cl, Br, I$ and $y = F, Cl, Br$
- B$x = F, Cl, Br$ and $y = F, Cl, Br, I$
- C$x = Cl, Br, I$ and $y = F, Cl, Br, I$
- D$x = F, Cl, Br, I$ and $y = F, Cl, Br, I$
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