A \( \mathrm{Fe}_{2} \mathrm{O}_{3} \)
B \( \mathrm{Fe}_{3} \mathrm{O}_{4} \)
C \( 2 \mathrm{Fe}_{2} \mathrm{O}_{3} \cdot 3 \mathrm{H}_{2} \mathrm{O} \)
D \( \mathrm{FeCO}_{3} \)
Correct Answer: Option D
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