Which of the following statements is true if red hot iron is reacted with steam?
It forms triferric tetraoxide
It's a reversible reaction if hydrogen isn't separated
Hydrogen gas is released
Iron oxide formed reacts with hydrogen and reduces back to iron.
When red-hot iron reacts with steam it forms triferric tetraoxide and hydrogen.
3Fe(s)+4H2O(g)⇌Fe3O4(s)+H2(g)↑
If the hydrogen formed is not removed, the iron oxide formed is reduced back to iron.