Difficult
An oxide of iron contains $69.9\%$ iron. Its empirical formula is: (Given: Molar mass of $Fe$ and $O$ are $56$ and $16 \text{ g mol}^{-1}$ respectively.)
- A$FeO$
- B$Fe_2O_3$
- C$Fe_3O_4$
- D$FeO_3$
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