Question

Question 5
Which of the following oxide(s) of iron would be obtained on a prolonged reaction of iron with steam?

(a) $\text{FeO}$
(b) ${\text{Fe}}_2{\text{O}}_3$
(c) ${\text{Fe}}_3{\text{O}}_4$
(d) ${\text{Fe}}_2{\text{O}}_3$ and ${\text{Fe}}_3{\text{O}}_4$

Answer 1

The correct answer is (c).

Iron reacts with steam to give ${\text{Fe}}_3{\text{O}}_4$ and ${\text{H}}_2$ gas. The reaction occurs as follows:

$3\text{Fe(s)}+4{\text{H}}_2\text{O(g)}\to {\text{Fe}}_3{\text{O}}_4\text{(s)}+4{\text{H}}_2\text{(g)}$