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Solution


Q.

Which of the following oxide(s) of iron would be obtained on prolonged reaction of iron with steam
1 FeO  
2 Fe2O3  
3 Fe3O4  
4 Fe2O3 and Fe3O4  

Ans.

(3)

On prolonged heating with steam, iron produces a mixed oxide of Fe3O4 with the evolution of hydrogen gas.

3Fe+4H2O⟶Fe3O4+4H2