Question

Which reaction is this?
\[4Fe + 3{O_2} + 3{H_2}O \to 2F{e_2}{O_3}.3{H_2}O\]

Answer 1

Hint: Here, four moles of iron reacted with three moles of oxygen and three moles of water and there is a formation of two moles of iron (II) oxide trihydrate. Here, the ferric oxide absorbed three molecules of water. Hence, it is represented as trihydrate. And this is an oxidation reaction which occurs in metal or metallic materials like iron.

Complete answer:
In this reaction, iron is reacted with oxygen and water and there is a formation of iron (II) oxide trihydrate or hydrated iron oxide is formed, this type of reaction is known as rusting which is a synthesis reaction. Here, rusting of iron takes place.
This reaction always takes place in the presence of water or moisture. And here, the oxygen will take three electrons from every iron and there is a formation of \[F{e^{3 + }}\]ions. Here, the rust is formed in the surface of iron metals. And it takes place by the redox reaction between oxygen and iron in a moisture-containing atmosphere. The oxygen acts as the oxidizing agent and the metal ion acts as a reducing agent.

Note:
The given reaction is known as rusting reaction and it is a synthesis reaction. Because, two molecules or two reactants are reacted and form one product. That is, oxygen and iron are reacted in the presence of moisture or water and there is a formation of hydrated iron oxide. But, here the number of moles of water will be variable. Generally, rust is used as a common name for iron oxide.