Question

state under what conditions steam can react with metal and non metal

Answer 1

Steam can react metal and non metal to liberate hydrogen.

Answer 2

It is metals with low reactivity that are capable of reacting with steam. When such metals react with steam, they form the oxide of the metal and generate hydrogen gas. Some examples of this kind of reaction are:

Mg + H2O (g) -> MgO + H2

2Fe + 3H2O (g) -> Fe2O3 + 3H2

On the other hand, non-metals do not react with steam. So, no change is brought about when they come in contact with steam.