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Balance: Fe + H₂O → Fe₃O₄ + H₂.

A3 Fe + 4 H₂O → 3 Fe₃O₄ + 4 H₂
B3 Fe + 4 H₂O → Fe₃O₄ + 4 H₂
C3 Fe + H₂O → Fe₃O₄ + H₂
DFe + 4 H₂O → Fe₃O₄ + 4 H₂
Answer & Solution
Correct answer: B. 3 Fe + 4 H₂O → Fe₃O₄ + 4 H₂
3 Fe on the left to match 3 in Fe₃O₄. 4 H₂O gives 4 O (match) and 8 H, balanced by 4 H₂ on the right.
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