Chemistry
If the following are kept in closed vessels at over 400°C what would happen to them ?
(a) iron filings and steam,
(b) hydrogen and magnetic oxide of iron ?
Hydrogen
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Answer
(a) Iron oxide is formed with liberation of hydrogen gas.
3Fe + 4H2O ⇌ Fe3O4 + 4H2 ↑
(b) Hydrogen when passed over heated magnetic oxide of iron, it reduces the oxide to free metal.
Fe2O3 + 3H2 ⟶ 2Fe + 3H2O
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