Question

When hot iron is exposed in hot water vapour the compound formed is?

Answer 1

We will get Hydrogen gas and Magnetite (Iron Oxide).

When steam (hot water vapour) is passed over red hot iron, the iron reduces steam to hydrogen gas and itself gets converted to iron oxide. 

This reaction can be represented by the following chemical equation:
 3 Fe + 4 $H_{2} O$ ---> $Fe_{3} O_{4}$  +  4 $H_{2}$ 

This reaction takes place only with steam (high temperature) and not with water at room temperature.


Thus, an Iron Oxide called Magnetite ( $Fe_{3} O_{4}$ ) is formed along with the evolution of Hydrogen gas when hot iron is exposed in hot water vapour.