The oxidation number of iron in \( \mathrm{Fe}_{3} \mathrm{O}_{4} \) is:....

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The oxidation number of iron in \( \mathrm{Fe}_{3} \mathrm{O}_{4} \) is:
\( \mathrm{P} \)
(1) +2
(2) +3
(3) \( 8 / 3 \)
(4) \( 2 / 3 \)


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